Im looking to putting in gauges into my 98 seville. Where can i find the wire to tap into for the RPM gauge and also the Oil PSI gauge. I have the service manual i just cannot find it in there. Any ideas guys?
Saw your other post - the tach that's already in the car is accurate. The oil pressure sending unit, on the oil filter adapter, is a go-no go unit - it does not transmit a variable voltage which would drive an electric gauge. You need to install a pipe T at the filter adapter, retain the present sending unit and either run an electrical gauge off a second proper sender or run a mechanical gauge using a capillary off the other side of the T.
You start tapping into PCM wiring and you may open a Pandora's Box.