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4-Bolt Head Spiral Gauges


The 8684 Top Mount Model 4-Bolt Head Medium Duty Spiral Gauge is designed for use in measuring liquid levels in gasoline, diesel fuel, bio-diesel, hydraulic and lubricating oils where space restrictions prevent the use of a swing-arm style mechanical gauge. It is ideal for medium duty construction & agriculture, lawn & garden, and recreational vehicle applications.

General Information & Features

• Field Replaceable Fractional Dial
• Solid Construction Head, No-Leakage Path to Dial

The 4-Bolt Head mounting of the 8684 Spiral Gauge allows a tight seal that restricts vapor loss. The 8684 4-Bolt Head Spiral Gauge is designed for top mounting and has an easy to read fractional dial. It is available in lengths from 6 to 20 inches.


Data Sheet

MS-501/502 Installation Instructions

General Specifications*


Designed for top mounting only.


Accuracy depends upon proper gauge sizing. Direct read dials +/-7%. 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.


Standard operating range is -40°F to 158°F, -40°C to 70°C.

Shock & Vibration

Suitable to mobile, off-road medium duty, and marine applications.

Tank Pressure

0 to 14.5 PSIG [0 to 1,0 Bar] maximum.

Tank Opening Details

Four 0.25"-28 bolt holes on 2.50" bolt circle, Ø1.750 center hole.

When Ordering Specify:

1. Gauge model number.

2. Tank depth.

3. Riser height, if any.

Materials of Construction*





Guide Rod

Stainless steel.


Stainless steel.

Tie Plate

Stainless steel.

Guide & Bearing Pin

Stainless steel.


Nitrile Ebonite.

Drive Magnet

Nylon 12 composite.

Standard Dial

Copolymer, hermetically sealed, gasoline resistant.

Magnet Holder & Centershaft Holder


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