Consent Preferences


Top Mount Acetyl 4 Bolt for Gasoline, Diesel, Bio-Diesel, Hydraulic & Lubricating Oil Tanks

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.

Product Inquiry - 8684

    Related Products

    Revised 12-18-2014