Tank Gauges – for boats, horseboxes and campervans

fresh water gauge and sender

Tank Gauges

Knowing what is available in your tank can be a guessing game at times. So why not fit a low-cost tank gauge and sender unit and know exactly how much is left in your tank.

This type is designed to fit into the water piping between the tank and the pump. It will measure a head of pressure from the stainless steel transducer fitted into the “Tee” section.fresh-water-gauge-and-sender

Mounting the Tank Gauge and Electrical Connection.

The hole cut-out for the tank gauge is as per diagram.

tank gauge template
Mark the hole centers 21.5mm apart, then using a small drill make two pilot holes. Now using a 32mm (1 ¼”) hole saw, cut out the two circles. Try the gauge and remove rough edges as necessary.
It will be easier if the calibration procedure is carried out before finally mounting the gauge as the gauge can then be connected and viewed easily while adjustments are being made.

Electrical Connection
Connect the wires to the connector blocks as shown using a wire gauge that fits the blocks. Multistrand 0.5-0.75mm CSA is ideal as this is a gauge of wire that can be supported and attached mechanically (Do not use single strand wire). Connect to supply in the range of 12-24 volts. Insert the plug into the sender ensuring that the two retaining clips on the plug fit over the OUTSIDE of the socket. If the sender and gauge are a long distance apart only the 0 volts and signal need to be run between the sender and the gauge leaving the + & – supply to be fed locally to the gauge and the + supply only to be fed locally to the sender.

electrical connectionsCalibration Procedure.
In most cases, it will not be necessary to adjust the zero unless the amplifier is sited in an unusual position for example below the floor of the tank. Should this be the case please contact us.

Fill the tank then run approximately two gallons of water off using the tap. This is to ensure that no water is left in the filler pipe as this will cause a false ‘full reading’. Although the main scale of the gauge is heavily damped, causing it to only move slowly, the calibration dot is almost instantaneous in function making adjustment easier.
If the dot is showing turn the ‘Adjust full’ control slowly anti-clockwise until it goes out then slowly clockwise until it just shows. If the dot is not showing turn the ‘Adjust full’ control slowly clockwise until the dot just shows.
After approximately ten seconds the main scale will show full.

calibrateMount the gauge in its final position using the double-sided adhesive gasket supplied.

Fit the lid using the three screws provided.  Your unit is now fully operational.
Please note that with the inline unit the gauge will read zero when the tap runs, but will quickly return to the correct reading when the pump stops.

Winterising Tips

As with all plumbing products water must not remain in the unit at temperatures below freezing. Depending on pipe runs, experience has shown that water sometimes becomes trapped when the system is drained, so we would always recommend that the product is removed to a warm place for winter storage.
This is easily achieved by undoing the hand nut where the amplifier joins the “T” piece, unplugging the green connector block then pulling the unit out of the “T”.

This option is suitable for freshwater or wastewater – other options are available for the fuel.


For more information please visit our website where you can see all of the products and prices.

You can also call us on 01663 734800 or email through our contact form.

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