Hooking up some gauges(98 VETTE) in a piller pod and having trouble idintifying the correct color wire to hook into my dash lighting circuit. Tested some color wires, but no go. Only thing i found out so far is red and orange are always hot. I am turning on my parking lights and testing. Would this be the correct way ??? A wiring diagram would sure help. THIS PROJECT IN HARD ON MY BACK...