Daihatsu Fukui-Keiki FKS 827058 Mechanical Tachometer – 300–1500 RPM, R 2:1

The Daihatsu Fukui-Keiki FKS No. 827058 is an analog mechanical tachometer / RPM meter intended for marine diesel-engine speed indication.

The SM MARINE SERVICE™ stock unit is clearly marked:

Engine Brand / Application: DAIHATSU
Instrument Manufacturer: FUKUI-KEIKI / FKS
Instrument No.: 827058
Measuring Range: 300–1500 RPM
Rotation Marking: R
Drive Ratio: 2:1
Display Type: Analog mechanical dial
Application: Marine diesel engine RPM / speed indication

The large analog face, threaded mechanical-drive connection and 2:1 ratio marking are characteristic of mechanical engine-speed indicators rather than an electronic RPM display.

What Is the Fukui-Keiki FKS Tachometer?

A tachometer measures the rotational speed of an engine or rotating shaft.

In this type of traditional marine installation, a mechanical drive transfers rotational movement from the engine drive point to the tachometer. The instrument converts this mechanical input into movement of the dial pointer, allowing engineers to read engine speed directly.

Fukui-Keiki FKS tachometers are documented in marine spare-parts markets for Daihatsu diesel engine applications, including 2:1-drive models. One documented Daihatsu/FKS unit is specified as 200–1000 RPM, 2:1, right-hand rotation.

Exact Identification of the SM MARINE SERVICE™ Unit

The photographed gauge has a white dial with a scale beginning at approximately 300 RPM and extending to 1500 RPM.

At the center/bottom of the dial it shows:

R
2:1

and below:

FUKUI-KEIKI
FKS
NO. 827058

The DAIHATSU logo is prominently printed on the dial.

These markings should all be included when requesting a replacement because range, rotation direction and drive ratio are critical for correct tachometer matching.

300–1500 RPM Measuring Range

The exact stock unit uses a 300–1500 RPM scale.

Fukui-Keiki FKS tachometers are available in different RPM ranges. A separate FKS marine tachometer is documented with a 300–1500 RPM, 2:1 scale, while other Daihatsu/FKS instruments use ranges such as 200–1000 RPM.

For this reason, an FKS tachometer with a different RPM scale should not automatically be used as a substitute.

The replacement should match the engine's normal operating-speed range.

What Does 2:1 Mean?

The 2:1 marking refers to the mechanical drive ratio for which the tachometer is designed.

This is an important replacement parameter.

A tachometer designed for a different drive ratio may physically fit the mounting position but indicate the wrong engine RPM.

Fukui-Keiki marine tachometer listings specifically distinguish instruments by drive ratio, including 2:1 versions.

Therefore, buyers should never select a replacement based only on the outer diameter or dial appearance.

What Does “R” Mean?

On mechanical tachometers, the R marking is commonly associated with the required rotational direction of the drive.

A documented Fukui-Keiki/Daihatsu FKS 2:1 tachometer is explicitly described as Right Hand Rotation, supporting this interpretation for the FKS product family.

For the exact 827058 unit, however, the safest replacement practice is to match the original R marking rather than relying solely on a generic interpretation.

Rotation direction is critical because a mechanical tachometer designed for the opposite direction may not operate correctly.

Marine Diesel Engine Application

This style of FKS tachometer is used for direct indication of diesel-engine speed.

Typical marine applications can include:

• Daihatsu auxiliary diesel engines
• Generator engines
• Shipboard diesel machinery
• Engine-room local RPM indication
• Mechanical engine-speed monitoring
• Legacy marine propulsion or auxiliary machinery installations

Daihatsu genuine/OEM spare-parts catalogues also list mechanical 2:1 tachometers for marine diesel-engine applications, confirming the continued use of this type of instrument in Daihatsu machinery.

Why Mechanical Tachometers Are Still Used

Mechanical tachometers have several advantages in legacy marine machinery.

They provide local engine-speed indication without requiring a modern digital display or complex electronic signal-processing system.

On ships where the original engine arrangement remains in service, replacing the failed mechanical gauge with the correct specification can be far simpler than converting the entire RPM indication system.

For this reason, old Fukui-Keiki FKS models continue to be sourced as marine spare parts.

Related Fukui-Keiki FKS Tachometer References

Several related FKS tachometer numbers appear in the marine market.

FKS No. 260977H

A documented Daihatsu/Fukui-Keiki tachometer:

Range: 200–1000 RPM
Ratio: 2:1
Rotation: Right Hand
Equivalent older number: 260977.

FKS No. 703210

A separate Daihatsu/Fukui-Keiki FKS tachometer is documented as:

Range: 200–1000 RPM
No.: 703210.

FKS No. 734337

Another FKS/Daihatsu meter is documented with:

Range: 200–1000
Ratio: 1:1
No.: 734337.

FKS No. 624284

A secondary-market Fukui-Keiki listing identifies FKS 624284 with a 300–1500 RPM, 1:1 configuration.

These related model numbers are useful SEO/search references, but they demonstrate exactly why different FKS instruments cannot automatically be considered interchangeable.

Range, ratio and rotation must be checked.

Daihatsu OEM Tachometer References

Marine parts records also show Daihatsu tachometers under engine-manufacturer part numbers.

Examples include:

Y311521200Z – Tachometer 100, 2:1, L1500

and

Y321821200Z – Tachometer 70, 2:1, L1800.

These are useful related Daihatsu tachometer search references, but no evidence reviewed establishes them as replacements for FKS 827058.

They should therefore be treated as related Daihatsu tachometer family references only.

Red Operating Range Marking

The photographed 827058 has a red section on the RPM scale.

This type of coloured dial marking usually identifies a designated operating or caution region established for the engine/instrument application.

However, the exact engineering meaning of the red range for No. 827058 should be confirmed from the applicable Daihatsu engine manual.

It should not be described as a fixed overspeed or alarm range without manufacturer documentation.

Installation & Replacement Checks

Before replacing the FKS 827058, verify the complete specification of the original instrument.

Important points include:

Instrument No.: 827058
RPM Range: 300–1500
Drive Ratio: 2:1
Rotation: R
Mechanical drive connection
Thread / mounting dimensions
Panel/flange dimensions
Engine model
Drive-cable arrangement

This is especially important because two FKS tachometers may look almost identical but have different speed ranges or drive ratios.

Common Problems & Troubleshooting

Tachometer Needle Does Not Move

Check the complete mechanical drive path.

Inspect:

Engine drive output → flexible drive cable → tachometer input connection

A broken or disconnected drive cable can produce a zero reading even when the tachometer itself is serviceable.

Needle Moves Intermittently

Possible causes include a worn, damaged or poorly lubricated drive cable, loose coupling, damaged mechanical drive gear or internal tachometer wear.

Inspect the cable before replacing the instrument.

RPM Reading Is Incorrect

First confirm that the installed tachometer has the correct 2:1 ratio and RPM range.

A mechanically compatible gauge with a different drive ratio can display an incorrect engine speed.

Compare the indicated RPM with another verified engine-speed measurement if available.

Needle Is Unstable

Check for:

• Mechanical cable vibration
• Damaged flexible shaft
• Excessive cable bends
• Loose connections
• Worn tachometer mechanism

Do not assume the gauge is defective until the drive assembly has also been inspected.

Needle Is Stuck

An internal mechanical fault may prevent pointer movement.

Before dismantling the instrument, confirm that the mechanical input is actually rotating.

Replacement Gauge Shows Wrong Speed

This is a classic sign of possible specification mismatch.

Check:

2:1 ratio
R rotation marking
RPM range
Drive arrangement

against the original instrument.

Maintenance Recommendations

Mechanical tachometers generally require less electronic troubleshooting than modern digital systems, but their drive mechanisms need correct installation.

Useful maintenance practices include:

• Inspecting the tachometer drive cable
• Checking coupling tightness
• Avoiding severe cable bends
• Keeping the drive connection clean
• Watching for unusual pointer vibration
• Comparing indicated RPM periodically against a known reference where required
• Protecting the instrument from excessive impact and moisture

Do not lubricate the instrument internally unless the manufacturer/service procedure specifies the correct method.

Spare Parts & Replacement Availability

SM MARINE SERVICE™ supports worldwide sourcing and supply of Daihatsu / Fukui-Keiki FKS mechanical tachometers and marine diesel-engine RPM meters.

Depending on stock availability, equipment may be supplied as:

New / New Old Stock
Used Tested Working
Refurbished
Reconditioned

For an accurate replacement quotation, customers should provide:

DAIHATSU engine model
FUKUI-KEIKI / FKS instrument number
RPM range
Drive ratio
Rotation marking
Front and rear photographs
Mechanical connection dimensions
Required quantity

For marine engine instrumentation and other ship machinery spare parts, visit SM MARINE SERVICE™ at www.smmarineservice.com.

Why Exact FKS Number Matters

Fukui-Keiki has produced many visually similar tachometers.

For example, documented FKS products include:

260977H – 200–1000 RPM, 2:1
703210 – 200–1000 RPM
734337 – 200–1000, 1:1
624284 – 300–1500 RPM, 1:1.

The photographed unit is:

827058 – 300–1500 RPM – R – 2:1

That combination should be treated as the primary replacement specification.

FAQ

What is Daihatsu FKS 827058?

It is a Fukui-Keiki FKS mechanical tachometer / RPM meter branded for Daihatsu marine diesel-engine applications.

What is the RPM range of FKS 827058?

The photographed unit is clearly scaled from 300 to 1500 RPM.

What is the drive ratio?

The dial is marked 2:1.

What does R mean on the tachometer?

In the FKS mechanical tachometer family, R is associated with right-hand rotation. A documented Daihatsu FKS unit is specifically described as a 2:1 Right Hand Rotation tachometer.

Is FKS 827058 an electronic tachometer?

The photographed unit has a mechanical threaded drive connection and 2:1 drive marking, identifying it as a mechanical-type RPM indicator rather than a modern digital/electronic display.

Can a 200–1000 RPM FKS tachometer replace this 300–1500 RPM unit?

Not automatically. The scale range, drive ratio, rotation and mechanical connection must match the engine application.

Can a 1:1 FKS tachometer replace a 2:1 unit?

Normally this should not be assumed. A different drive ratio can result in an incorrect RPM indication.

Is Fukui-Keiki used with Daihatsu engines?

Yes. Multiple marine spare-parts records document Fukui-Keiki FKS tachometers branded for Daihatsu.

What other FKS tachometer numbers exist?

Documented examples include 260977H, 703210, 734337 and 624284, among others. They are related search references, not automatically interchangeable parts.

Where can I buy Daihatsu FKS 827058?

SM MARINE SERVICE™ can support worldwide sourcing of Daihatsu / Fukui-Keiki FKS marine tachometers and engine instrumentation, subject to current stock availability.

Short Product Description

Daihatsu Fukui-Keiki FKS No. 827058 is a mechanical marine diesel-engine tachometer / RPM meter with a 300–1500 RPM measuring range, R rotation marking and 2:1 drive ratio. Fukui-Keiki FKS mechanical tachometers are widely found in legacy Daihatsu marine engine installations and are available in multiple ranges and ratios, making exact specification matching essential. SM MARINE SERVICE™ supplies Daihatsu engine instrumentation and Fukui-Keiki FKS marine spare parts worldwide in new, used, refurbished and reconditioned condition.

SM MARINE SERVICE™
Marine Automation & Navigation Equipment Supplier

Available Condition:
• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment

Stock Location:
• Bangladesh • China

Services:
• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing

Contact Information
SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com