Question on electrical gauges

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Yes, but I do not know if the accuracey is maintained. The sending unit is more like a ground that resistance is measured.

A temp gauge changes resistance due to heat.
Gas gauge has an arm to vary resistance.

I actually don't see why not.
 
It depends on the gauge type and the sender type, and it goes without saying that both gauges must be calibrated for the sender. There's a couple different possibilities depending on whether the gauge actually reads current or voltage, and whether the sender is resistance based or puts out a voltage curve. Most stock A-body gauges react to current, not voltage.

Putting two current based gauges on one sending unit will work with maybe a small penalty to accuracy. Putting a voltage based and a current based gauge on the same sending unit will make the voltage based gauge give a false reading and might affect the accuracy of the current based gauge though not as much. Two voltage based gauges sharing a resistance based sending unit will result in neither one reading correctly. Two voltage based gauges on a voltage sending unit will work without any trouble.

A good sign you're dealing with a sending unit with a voltage curve is that it needs a power supply wire. These gauges must be used with voltage based gauges. If the sending unit isn't powered, it's resistance based, but figuring out what is going on inside the gauge is a bit harder.
 
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