I`m using lots of seperate Smiths Gauges in my Jago dash. I`ve got them all working but I`ve noticed that the fuel gauge is reading just over half a tank of fuel whatever the amount of fuel there is in the tank (including when empty). The fuel tank and its sender are Ford Escort mk1. I realise that the old Escorts used a voltage stabiliser for the fuel & temp gauges so I`ve wired one of these in (see diagram) because without it neither gauge will work. (I`m using the original escort stabiliser)
Any ideas on how to cure problem? The only thing I can think of doing is to earth the voltage stabiliser by it`s mounting hole and see if this makes a difference?

I would have though the voltage regulator need to have a ground reference.

Adrian

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Originally posted by AdrianH
I would have though the voltage regulator need to have a ground reference.

Adrian

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if the ground doesn't sort it, look at fuel gauge wizard on ebay.

The regulator does need to be earthed but I suspect that you will still have a problem.I have a smiths gauge and a sender from an early ford possibly cortina mk1, what I did was to make an adjustable voltage stabiliser but found that when set up to read empty when the tank is empty that it only reads half full when the tank is full.It is one of those jobs I keep meaning to sort out but never have, ideally a smiths sender unit is needed or a circuit to allow it to be compensated for.
Paul

I wired an earth to the voltage stabiliser and immediately both the fuel & Temp gauges dropped to just above empty. But, there they remained, as the engine warmed up the temp gauge didn't move. The gauges mirror each other with their readings. Hmm, what to try next?

the sender and gauge must not match, easy fix is a fuel gauge wizard from ebay to calibrate the gauge.

connect the sender wire to a good earth and see if the gauge goes full scale, disconnect and see if they sit at zero. You can calibrate them using the holes in the back. http://www.mgb-stuff.org.uk/fuel.htm

Some interesting reading there Scimjim. I`ll take another look but it may be that I need to look at one of those fuel gauge wizards.