<VV> Aftermarket gauges

[Sethracer at aol.com]

In a message dated 7/22/2008 9:43:29 A.M. Pacific Daylight Time,  
akinzelm at greatnortherncorp.com writes:

Guys,
A while back we parted out a car with aftermarket gauges - oil  pressure & 
oil temperature.  These are both electrical, and indicate  about midscale.  Is 
this normal - or are they  nonfunctional?
Thanks,
Andy K.




Andy - Do you mean they are sitting at mid-scale without being connected to  
anything? Did you get the sending units for the gages? Electrical gages are  
usually fed 12 Volts on one pin, and the sending units vary their resistance to 
 ground from the other pin to change the indicator. The indicator is really  
reading Ohms of resistance, but is labeled in the equivalent units, like 
degrees  F or Lbs per square inch. So the gage doesn't really read anything unless 
it is  powered up with 12 volts, and a sending unit is attached on the other 
end. -  Seth Emerson



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