I too have an oil pressure sender unit that I picked up on EBay. I believe it goes in place of the oil level sensor located beside the oil filter. There should be a yellow wire tied back to the grey loom which should be hanging freely near the oil dip stick or between the radiator and the engine. Connect both the yellow and the orange wire (that is connected to the oil level sender) and you should have a result, although, I'm not 100% sure of the polarity!
Now I just need the time to fit mine :-O
NB* new copper washers need to be fitted to the pressure sender unit to prevent any leakage.
Good luck...
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