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Problem solved, checked the resistance at the sender gauge wire, about 500 ohms which is ball park according to an email from egauges.com so the problem was found in a further check of the voltage at the gauge + terminal. Only 0.72v so way low. Don't know what the terminal was for that I connected to center cluster on the back of the speedo but it was obviously the wrong one. Looked at the back of the cluster on the right side and found a red wire from the harness connected to a bayonet terminal. I suspected it was the harness connection for main voltage source to the cluster. Ignition off, zero volts, ignition on, 12.25v what it should be. Moved my gauge connector to it and got the 12 volts at the gauge. Driving next day, the gauge began registering as expected. Problem solved and gauge operational! It only came up to about 1/3 of the scale between the 120 and mid gauge value of 210. Guessing the unmarked lines seem to be in 30 degree steps so the gauge came up to about 150 or so on a drive around the area in 60 degree weather. Winter hit on Thanksgiving so the gauge was not so active, as expected but it still rises. All is good. Thanks for your input!
Roger
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'85 240 DL B230F 4spdOD 330K; '87 740GLE B230F ZF22 340K
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