VDO oil pressure sender

[HXsman]

Hey Damian, Ill run them again in the morning, thanks for looking

[damienengland]

If it gets a bit confusing, you can always break the system down to its core components and do process of elimination. In bigger terms, you should have 1) Sensor, 2) Wiring, 3) Gauge cluster and two of these can be tested fast. If you transpose the resistor concept, you could measure resistance instead of introducing it. Have a look at the following document link. If you know the possible resistance range for bad or good oil pressure, then disconnect the sensor wire and connect a multimeter to the sensor to watch the resistance change when you run the engine. If 73 ohms is lowest gauge position and 10 ohms is full scale, then you can judge the values you read on the multimeter against the running conditions. For example, a cold engine will generally deflect the needle a long way up the scale before it gets hot, so you might expect to see much lower ohms on the multimeter at this stage. If it looks good, move the multimeter to the wire as it connects to the gauge cluster and repeat. if it looks good, then the gauge should be the culprit.

Link here: http://www.bolec.com.au/105001nocap-r4c.pdf