When your oil pressure gauge isn't reading properly or not at all, it might be time to replace your 1979-93 Fox Body Mustang oil pressure sending unit. This sending unit sends pressure readings to your gauge for in car readings. Not knowing your oil pressure can keep you from knowing potential problems in your engine. Make the fix with a new sending unit, wire terminal, and sending unit extension. Shop Latemodelrestoration.com for your oil system needs.