I'm still looking at the clocks on my Golf. The earth's not the problem, and everything else seems alright, so I'm beginning to suspect the oil pressure switches. The thing is, the computer bit of the clocks doesn't seem to be registering that the ignitions on, let alone that the car's started. One of the signals going into the computer is from the oil pressure switch, and I've gotten to be wondering if the low oil pressure signal you get before you start the car could be used as a wake up signal for the computer. So I decided to have a look at the pressure switch(es), and found it only has one wire.
How does that work then?