[QUOTE=jr7089;1672607]Is it possible that it could just be something electrical such as pressure switch? Just wondering since it drops from 35 to 0 all of a sudden then will jump back up within 5 seconds or after turning off the engine and restarting.

Thanks[/Q]

I was going to suggest the sending unit until I read you first post again. You said the valves start tapping when the pressure drops. If this is correct there is no way its just a sending unit. Don't waste your time or money on a sending unit. Try a new oil pump and see what happens