VDO Oil pressure gauge connections

Note the diagram to the lower right with the power boat on it,this has a sender unit that is what is called 'Above Earth' (thanks for this info Tony) if you check the diagram to the left,you will note that the sender unit is grounded,this will cause stray currents in a marine enviroment and is not recomended due to corrosion,probably your engine.

Testing your sender unit,you will need a multi meter with an alarm,that or a 12volt test lamp.With the engine stopped you should have an open circuit,meaning the tester will sound its alarm,or in the case of a test lamp,it will light up.When the engine is started there will be no continuity.

VDO Above Earth sender unit code number for a 5 bar and 74 psi gauge ,the old part
number was 360 723 the new number is 360081032001c

Note,on VDO gauges the letter G means Gerber,meaning signal,not gound,WK means switch terminal and M means earth or negative.


Left click the picture to view full size.

note the date on the lower left hand of the drawing,seems I have kept it some 32 years!