Oil pressure gauge not working in your 1979-1993 Mustang? Get a new oil pressure sensor at 5.0 Resto. These Foxbody replacement oil pressure sending units measure the pressure in your oil system and transmit that back to your gauge. Without proper reading, you might not know about problems in your oil system until its to late. Make the fix today with a new sending unit, wire terminal, or sending unit extension. These parts fit 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, and 1993 Fox Body Mustang.