1991 Oldsmobile Ciera fuel pressure

Depends on your engine size? 4 cylinder is probably TBI, you need a tbi fuel pressure gage. Installs inline on the supply line. If you have a 6 cylinder, there should be a schrader valve on the fuel rail, looks like a metal tire valve. You need an mfi fuel pressure gage for that. The autostores sells the the fuel pressure gages.