[bigred90gt]

Unless you bought your guages used, the water temp guage should have come with a new sending unit. I tried to use my stock sending unit, and it didnt work. Replaced it with the supplied one, and it worked like a charm. Just out of curiosity, why do you still want to use your stock guages, knowing the inaccuracy of them? I dont think it will turn on the check engine light, mine didnt.