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I've read all I can read about the intermittent speedometer on my 1992 740T wagon (175K). Checked the plug/cable at the sending unit bolted to the differential. Installed a used speedometer sending unit over the weekend. Still no fix. Odometer is also not working. Is it possible to "see" the signal out of the sending unit with a Volt/Ohm meter? Not quite ready to drop $120 bucks for a new sending unit unless I can prove the old and new/used ones are defective. Any trouble shooting ideas would be much appreciated.
current
1989 240DL
1989 740 16V
1992 740T
past
1984 240GL
1989 780
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