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01-14-2018, 12:20 AM
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#16 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 5,050
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Re: Temp Gauge or Overheating??
It'd be interesting to observe the resistance of the sender as the engine warms up. Just to get a handle on what's happening with the new sender.
The sender Ohmage is measured from the wire connection terminal to the threaded body of the sensor or the head. I experimented a bit with a couple squarebody gauge clusters on my electronics bench using calibrated resistance decade boxes and a lab DC power supply. One of the mid 80's TEMP gauges I tested took 110Ω between the sender and supply ground to drive the needle to 210° or so and 60Ω at to peg the needle at 250°. If the sender is reading close to 60Ω at 204°F engine temp the sender is spent.
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