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Old 07-06-2010, 03:21 PM   #21
Bus Crazy
Elliot Naess's Avatar
Join Date: Oct 2005
Location: Clearlake, Northern California
Posts: 1,746
Year: 1992
Coachwork: Blue Bird
Chassis: TC-2000 Frt Eng, Tranny:MT643
Engine: 5,9 Cummins
Rated Cap: 84
Re: How to retrofit tachometer on Cummins 5.9?

Over the years, I have seen gauges that "float" randomly when the engine is off. Probably nothing to worry about if they work properly when the engine is running.

Some temperature gauges may simply show the present temperature no matter what -- just like the thermometer on the wall of your house. My pyrometer works that way. Right now it shows almost as much as the thermometer on my front porch. I'm not familiar with the pyrometer technology, but there is definitely NO normal 12 Volt wiring involved.

It would be the same with an old-fashioned "mechanical" temperature gauge, where the gauge-tube-and-sender is all in one sealed piece.
Millicent The Bus - roof raised two feet, toy-hauler tailgate.
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