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Diesel Locomotives and Rail Car Gauges

8900-B8900 Product Photo


Model HD6993 gauges are designed for extended life and accurate readings of fuel levels in tanks aboard diesel locomotives and rail cars.

General Information & Features

Model HD6993 gauges are for side or angle mounting. Tank drawings and strapping tables should be submitted with all inquiries.

These gauges feature an easy-to-read 4" [100mm] fractional dial, or calibrated in gallons as an option, with an accuracy of ± 2.5%. A special calibration and functional check is performed on each gauge. A special close-tolerance pinion gear is included for minimum gear lash.

Stainless-steel materials have been selected for many components to ensure reliable service and maximum strength. Hard nickel coated gears and bearings minimize vibration-induced wear, and special construction reduces the amount of care necessary to prevent calibration changes during shipment, installation and service.

An optional support collar is available for gauges with unusually long supports and support pipes extending into the tank interior.


Data Sheet

Mounting Standards MS-518

General Specifications*


Side or angle mount.

Dial Data

Dials are hermetically sealed and tested in a 8" Hg vacuum. Fractional calibration is standard with gallonage calibration optional. Dial angles, computer generated, from customer supplied strapping tables are also an option. Fluorescent dials optional.


Depends on proper sizing of gauge and tank configuration. Direct accuracy is ±2.5%. Maximum parallax error = 1.5%. Repeatability direct = 1%. Sensitivity = 1%. Hysteresis is 2% including gear and pointer lag. Fricitional loss = 1%. 100% conformity inspection optional.

Temperature Range

Standard range is -50°F to 200°F, -45°C to 93°C.


Tested per MIL-S-901B, naval std. (similar gauge)


Tested per MIL-STD-167, naval std. (similar gauge)

Tank Pressure

0 to 50 PSI, [0 to 3,4 Bar].


U.L. listed for flammable liquids.


*Materials and specifications are subject to change without notice. Pressure ratings subject to change due to temperature and other environmental considerations.

Materials of Construction*


Diecast aluminum. 4-1/4" [107, 9] B.C.


Buna "N" 0015-00422.

Dial Chamber

Aluminum with tempered glass crystal. Polycarbonate crystal optional.

Drive Magnet


Centershaft, Cross Stud, Support and Float Arm

Stainless spring steel.

Gear and Bearings

Hard nickel-coated stainless steel.


Closed cell hard nitrile rubber.

Gear Housing

Stainless steel.

Material Trim for Water Service



When Ordering Specify:

All options desired. Always furnish tank drawing and strapping table.