Scored all my parts and i am about to start the project. One problem, my factory oil pressure switch is MIA. The owner of the car before me put in a VDO oil pressure gauge and i guess rigged up the factory wiring to bypass the switch completely. I cant find the wiring anywhere. How do i wire the new oil pressure sender? Its got 4 wires. I know one goes to ground but which one of the other three will go to the gauge. I figure since i cant find the factory wiring, ill just run the one wire all the way to the cluster along with the water temp sender wire. Just need to know which one. Thanks in advance.