Ok I'll be driving and the oil pressure will go way down then come back up after a few seconds. Sometimes longer than others. It seems to do it after I shift. I have heard about sender units going bad. Where is the sending unit so I can change/check it?

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1988 IROC-Z T-Top "MATTSTOY"
350 Crate engine
370ft. lb Torque STOCK
5speed Centerforce clutch, Spohn Sub-frames, Jamex 1.5 Lowering springs, 2 1/2' Exhaust,ram air setup

 

your sender ought to be near the distributor. if you don't know what one looks like buy the replacement so you do ,and buy a socket to fit the sender.

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ICON Motorsports

1st & 3rd
MM Black Diamond 538 F&AM