This is how most vehicles (circa 1981 at least) do it. Allows you to test for a bad sending unit by simply touching the wire to the block (BRIEFLY! Leave it there too long and you'll burn up the tiny wire that moves the pointer). Bill Robertson #5939 >--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@xxxx> wrote: > > ...because the gauge is powered byt he battery as well as using it to > generate a reading. The gauge has obviously been designed properly such > that it makes sure to adjust based on supply voltage. > > The actual sensor is a resistor to ground which changes with temperature. > > Martin > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/