Removing my old school oil and water gauge set up and replacing with electric sending units . I have a couple question perhaps you guys can answer. If i'm understanding the directions correctly for the new sending unit for oil it says to toss the old sending unit (factory) and abandon the old wiring (a 2 wire set up with a locking collar) and pull a new wire. Am i understanding this correctly? The sending units are to tie into the ignition circuit (beneath the dash? ) Suggestions on where to tie in to ignition? These are VDO purchased from Kirban btw