bigcam

hey guys. i posted topic in a fews days ago about an oil leak and found out is the pressue switch. but wen i get a new 1 how does it get wired, because iv put my 4wd engine in a mk1 escort, and there is no wiring 4 it. so im starting from scratch with wiring 4 it. is it just a 12v in, and then out 2 the new light on the dash. which i will have 2 get aswel. thanks. shaun.