Tape 2 d cell batteries together and attach wire to each end and that will your test voltage 3 volts ,gauges will read about half.have some rally gauges I would like to test before I offer them for sale>>>>
how much voltage do they require so I don't fry them(I know at least under 12v dc)
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That doesn't apply to the 3 post gauges. "I" is input for all. "S" is sender for all.The terminals on the back of the gas gauge are marked “A,” “S,” and “I.” Test it with the “I” and “S” terminals.
2 D cell batteries should show 1/2 of full reading, 3 D cells near 100%