Have these gauges to go in. So far I got the proper fittings I needed for "adapters" for the new sending units. Water temp is done minus the wiring. Now for the oil pressure, I've been reading that if I don't use a Tee fitting and keep the stock sending switch hooked up, i'll have a low oil light on permanently? If thats true I'll get a tee and run both. My water temp and oil pressure gauges (factory) do whatever they want.