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To all you menders of instruments..
I'm presently going through the gauge/sender system on the vette, to make sure it's indicating the right temp.
I've been looking through the wiring diagrams, and although I understand pretty well how the system works in principle (ie, sender resistance gets lower as coolant warms up, giving a bigger voltage drop across the gauge), I'm still a bit unsure of what exactly is going on inside the gauge itself. To me, it would seem logical for the temp gauge to have two terminals.. one for power in, one for the wire to the sender, but looking at the diagrams it seems the gauge uses a third, ground, terminal. What's happening in there?!
This is all purely out of interest, I'm just letting my curiosity get the better of me, really. The main point of the excercise was to see how accurate the gauge is against a k-type thermocouple, but this question has made me go off on a tangent!
Thanks
Theo
I'm presently going through the gauge/sender system on the vette, to make sure it's indicating the right temp.
I've been looking through the wiring diagrams, and although I understand pretty well how the system works in principle (ie, sender resistance gets lower as coolant warms up, giving a bigger voltage drop across the gauge), I'm still a bit unsure of what exactly is going on inside the gauge itself. To me, it would seem logical for the temp gauge to have two terminals.. one for power in, one for the wire to the sender, but looking at the diagrams it seems the gauge uses a third, ground, terminal. What's happening in there?!
This is all purely out of interest, I'm just letting my curiosity get the better of me, really. The main point of the excercise was to see how accurate the gauge is against a k-type thermocouple, but this question has made me go off on a tangent!
Thanks
Theo
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