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6700 Series Gauge

Fixed Length Magnetic Gauges


Measures gasoline or diesel fuel levels in tanks on trucks, boats, generators, recreational vehicles, and other applications.

General Information & Features

These top mounting magnetic liquid-level gauges are built to the high standards of all Rochester designed instruments. The construction permits the replacement of dials when necessary without releasing fumes or liquid to the atmosphere.

Both available dials are fractional and silicone-dampened, and are easily replaced by removing and reinstalling two screws. Rochester's rugged gear drive incorporates shrouded, stainless-steel, beveled gears designed to work out any loose particles that might affect gear function. Sealing between the gauge and the tank is achieved through the use of the 0015-00423 Buna-N gasket.

Model Number Magnet Available Dials
6741 Large Alnico Direct-reading dial or TwinSite® sender.
Choice of 0-30, 0-90, 240-30 Ohms
6781 Small Alnico Direct-reading dial only.


Data Sheet

Installation Instructions MS-532

General Specifications*


Recommended for top-mounting only.


Accuracy depends upon proper gauge sizing. Junior dials ±6%, TwinSite® dials ±10%. 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.


For high humidity and marine applications, painting of gauge, less dial, is recommended.

Shock & Vibration

Suitable to mobile applications.


0.5 watts maximum for TwinSite® versions.

Tank Pressure

0 to 10 PSIG [0 to 0,68 Bar].


Some models are UL recognized for marine service. Some models are UL listed for flammable fluids. Passes BIA fire test.

Note: For Installation Instructions see MS-532.


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

Materials of Construction*


Die cast aluminum with standard SAE gasoline gauge flange (2-1/8" [54 mm] bolt circle fop 5 #10 screws. Screws not furnished.)

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, 0015-00423.

Direct Reading Dial

Hermetically sealed polycarbonate.

TwinSite® Sender


When Ordering Specify:

1. Gauge model number.

2. Tank depth.

3. Float orientation, 3 o'clock standard.

4. Details on any optional features.