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Registered
Join Date: May 2002
Location: Santa Barbara, CA
Posts: 4,821
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Think about it. I'm assuming the dash instrument is registering nothing. So either the sending unit failed OPEN or else:
If the sending unit failed open and you "replace" it by using a jumper wire in the needle should go all the way up with the ignition ON. If not there is something wrong with the wiring to the sending unit. One wire is GND and the other runs to the instrument itself. If you short these the needle must move.
The sending unit is just a variable resistor as you said.
Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430
I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs
Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!!
How about a NoBadDays DualChip for 964 or '95 993
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