Trying to hook the stock gauges up on my Pig and need an oil pressure sending unit for a GAUGE not an indicator light. PO took out stock gauge cluster and put in a tach on the left side. Bought a gauge with the oil, temp, amps and fuel gauges that I am going to put into the correct place in the dash. I plan on using stock sending units threaded into bushings into the SBC 400 (I hope that this will work). I have the temp sending unit but local parts wants like $40 for the oil sender. Help!! Thanks.