This problem is on my 83 TD. Since it's a wagon I will have to take the cargo area floor apart to get to the sending unit. I checked the price of the sending unit through our host here and it is listed at $182.
With my water temp gauge, it stays on zilch, notta, zero. Would disconnecting it at the temp sensor change anything. What kind of voltage numbers should I be reading..
I hope like hell, for the water temp problem is a temp unit, that's listed at $23. If it's the gauge, I have to replace the whole gauge along with the oil press and fuel level and that's $430

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member