Crash1647545504 Posted July 16, 2004 Report Share Posted July 16, 2004 i bought a volt guage i was instructed to just put the power wire to a 12v sorce where its not hott when the car is off. i did so (spliced it into the power wire for my boost guage) it lites up but no reading.... why? Quote Link to comment Share on other sites More sharing options...
Guest mudbutt Posted July 16, 2004 Report Share Posted July 16, 2004 did it have 3 wires? one for illumination? Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted July 16, 2004 Report Share Posted July 16, 2004 it has to be inline you should have hot in and hot out plus a ground to make the light work Quote Link to comment Share on other sites More sharing options...
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