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Message: <blockquote data-quote="weendoggy" data-source="post: 1532738" data-attributes="member: 23340"><p>I use Autometer gauges in my Cobra and the Oil Temp. gauge needs to have 12v feed and one to the sender. There will be a third one for light if you want. Testing the gauge is easy, key-on, ground the sender wire while watching the gauge and it should peg. You need to have the gauge wired correctly to test. So, even if you had 12v. key-on power to the gauge you can test by grounding the sender terminal (at the gauge) while watching and it should peg. If the gauge test works, but not from the sender wire (engine) then you have a break between enging and gauge sender wire.</p></blockquote><p></p>