Another temp gauge problem

zigs said
I have a Bosch electric temp gauge. Was working great went to start car gauge
pegged to 220 (cold). I've ran all the tests
grounding sensor wire, running a jumper
even replaced the sensor. Can I assume the gauge is dead or can I just test the
gauge. Like I said it was working , haven't
done anything different. Yes I did drain the
radiator . Does the sensor need fluid
in order for the gauge to operate? You wouldn't think so as one of the test is to
ground the sensor wire . Thoughts?
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Did you ever get this resolved? I have the same gauge, brand new and it does the same thing, pegs to 220. I haven't rechecked anything yet. Was hoping you got it figured out and it was something simple. I'm a little frustrated right now because I had a mechanical gauge brand new that didn't work. I did test that one and confirmed it was no good.