Dit staat op de volgende VDO site:

http://www.egauges.com/Inst_PDF.asp

Gauge Testing:

If a gauge is suspected to be faulty, the following tests can be performed on the VDO gauge:

1) Turn the key on:

Temperature Gauge - pointer to temperature of engine water

2) With the key on, pull sender wire off the sender:

Temperature Gauge - pointer will go to maximum left hand position

3) With the key on, ground the sender wire to the engine chassis:

Temperature Gauge - pointer will go to maximum right hand position

4) All VDO electric gauge pointers peg full left hand position with the power off.

Op de site staat ook hoe je de sensor door kan meten.

Suc6 er mee.