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6500 Series Gauge

Senior Adjustable 4-Bolt Gauges


The 6500 Series Senior gauges are designed for use in low pressure tanks 0-25 psig [0-1,7Bar] containing diesel fuel, gasoline, fuel oil and lubricating oils.

Used in many applications such as construction equipment, stationary generators, boats, farm equipment and home heating.

General Information & Features

The 6500 Series Adjustable Senior gauges are available in gear-action models for top mounting.

The standard float is nitrile rubber. The gauge is mounted to a mating Senior flange 2 1⁄2" bolt circle [63,5mm] using four 1⁄4"-28 x 9⁄16" long bolts. The gasket is Buna-N.

Top Mounting Adjustable Liquid-Level Gauges

Model Number Mounting Dial, Sender or Switch Data Support Length "S"
6580-0151 Top #5002S01379 Senior direct-reading fractional dial 3"
6540-00090 #5880S02547P (0-90 Ohms) 3"
6540-00252 #5AVHS03213P(240-30 Ohms) 3-5/8"



Data Sheet

MS-501/502 Installation Instructions

DS-337 Cut-off Dimensions (available upon request)

Adapters 22 Series - Senior Sheet Steel

Adapters 22 Series - Senior Machined Steel

Adapters 22 Series - Senior Zinc

6500 Ajustable Drawing

General Specifications*


Accuracy depends upon proper gauge sizing. Senior dials ±7%, TwinSite dials ±12%. Accuracy may be less depending upon tank shape. Accuracy may be less near full and empty. Accuracy may be less if tank is not level. This gauge is not to be used for filling. All accuracy estimates are expressed as a percent of full scale.


-40°F to 158°F, -40°C to 70°C.


Point exposed portions of gauge, less dial, for marine applications.

Shock & Vibration

Suitable to mobile applications.


0.5 watts maximum for TwinSite versions.

Tank Pressure

Up to 25 PSIG [1,7 Bar].


These direct indicating gauges are UL listed for flammable liquids. Some modesl UL recognized for marine service.


Note: For installation instructions see MS-501/502 (mounting standard).


When Ordering Specify:

1. Gauge model number.

2. Tank diameter and riser height.

3. Mounting location.

4. Ohm range on TwinSite® versions.

5. Preferred switch on switch gauges, if other than standard.

6. Any listed options or preferences.

Materials of Construction*


Die cast aluminum.

Centershaft, Support Tube & Float Rod

Tempered aluminum.

Gears, Cross Stud & Bearing

Stainless steel.

Drive Magnet


Gear Housing

Acetal plastic or Aluminum.


Nitrile rubber.


Buna-N, 0015-00004 or 0015-00079.

Direct Reading Dial

Aluminum with acrylic crystal, hermetically sealed.

Side Reading Dial

Aluminum with polycarbonate crystal, hermetically sealed.

TwinSite Sender


Mounting Bolts

Zinc-plated steel 1/4"-28 x 9/16" long.


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