so i've done some checking and,...
5.87v is supplied the the vdo sensor from the oil pressure gauge, and at 0 bar, the voltage is 0.50v.
so i am presuming this is workable.
Going to try and take other readings 0-5bar, need to think how to test it.
then i presume i need to attach the second vdo sensor wire to some spare analog channel and then come up with some input calibration.
scott