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Smiths fuel gauge


zhap135

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I acquired a smiths fuel gauge off FB marketplace. Have wired it up to my sierra fuel float, and seems to work as expected. Have only left it on for a short period to test the principle. 

I have seen on various forums a requirement for a voltage stabiliser and or resistors but am getting conflicting info. Does any one have a definitive answer. Do I need this? 

Same question for a smiths temp gauge

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It depends on how accurate / repeatable you want the guages to be.

If you are happy with a vague indication then no regulator required they will move about 5 to 10% depending on engine speed and other loads on the electrical circuit.

Otherwise a voltage regulator will make them stable.

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1 minute ago, IanS said:

It depends on how accurate / repeatable you want the guages to be.

If you are happy with a vague indication then no regulator required they will move about 5 to 10% depending on engine speed and other loads on the electrical circuit.

Otherwise a voltage regulator will make them stable.

Brilliant, thanks that makes sense. So it's not essential to protect the dials or anything, it just simply improves stability and accuracy.

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