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Yes that is correct. Most older electric gauges have a resistance movement. A quick and dirty check on this type of gauge. 1. Disconnect the wire at the sender on the engine and hold it away from the tractor. Then turn on power to the gauge (ignition?) the dail hand will deflect to the stop on the cold side of the scale. 2. With the power still on, touch the sender wire to the tractor frame, the dail hand will deflect to the stop on the hot side of the scale. That simply means the gauge works, not that it ranges properly or won't stop working due to vibration or whatever when the tractor is running. The above applies only to resistance movement gauges, grounding the sender wire is only slightly higher current than that when an engine overheats, won't damage the gauge unless it is already very sick. Here again, I don't know which type gauge movement you have and it is possible to damage other types of gauge movements by grounding the sender wire. You can try #1 above, won't hurt any gauge. If the dail hand deflects to the cold stop, odds are it is a resistance movement. Case used a lot of Stewart Warner gauges, I have not seen any SW doing this era that was not resistance movement, doesn't mean they don't exist though. Look at the very top of the faceplate, may have SW plus a p/n. If you are going to try #1 & 2 above, disconnect the sender wire at the gauge and use your jumper wire. Sorry to ramble so much, been a long day, can't seem to get both brain cells working together. Joe
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