so i need it a water temp gauge and i wanted an electric one rather than a mechanical one and the only one i could find was an indiglo one. even tho i dont like the look i need it till i can get all the gauges i need for the project now the intructions that came with the gauge only show me how to instal the gauge part not the light (indiglo) i thought it would be pos and neg but i guess not cus i tested it and didnt work now is there a special way to do it? how do i hook it up there is 3 gauges coming for the temp like probe, ground and ign the on top 2 cables that go to a plastic box the 2 cables out one with a fuse

man i feel like an idiot lol

 

Pics of back of gauge

 

no pic in the back