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!
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