Hello everyone!
I have a 1994 FD and I have the Defi gauges for boost, oil temp, water temp, and oil pressure. J fortunately for me, my oil pressure gauge is not giving me any info. The gauges all function properly but the oil pressure gauge just sits at zero with the red light on CONSTANT and a ring sound goes off. I noticed my oil pressure gauge wasn't functioning after a normal drive. When the car was on, it ran normally but the gauge was at zero with the red light BLINKING. The defi manual points to a wiring issue. Electrical issues is not my favorite ares 😅
Any suggestions?

 

Where do you have the sensors plumbed in?

Is the oil pressure gauge on the dash working?

Have you verified the connection from the sensor back to the box that controls the gauges?

Dale

 

Just to add to Dale's advice, the oil pressure sensor is almost certainly located in the oil pedestal under the oil filter, I'd check here to find the sensor and see if the wiring is connected,