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				 Thanks 
 Thanks Kevin and Bob,
 Having the wiring diagrams on line is a wonderful resource. Is there a way to put keywords on the files so that a google search on "Bristol 411 wiring" would come up?
 
 Looks like the right wire is hooked to the sender. So next I have to rummage in my old stock to see if I have a temperature gauge from an Alfa, G-wagon or some other old car to test. These are times when I do miss being in the USA where I would just pop down to the parts store and buy a sending unit.
 
 Claude
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