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Thanks all for the replies. Got the speedo cable off (what a hassle to reconnect). Replaced the stabilizer and still no luck. But, shorting the sending wire at the sender did at least give the gauge some life. Went to about half scale instead of full. That suggests it is the sending unit...

Any tips for removing the speedo cable? I need to do that to replace the stabilizer. It has a plastic clip on the end that goes into the speedo. For the life of me I cannot remove it. Does it just twist of? Thanks

Yes, that is an option!

Thank you all for your help. Unfortunately a previous owner has wired in a lot of accessories (winch, tach, fog lamps, stereo (!) and a cigarette adapter) so I am having an issue tracing the wiring diagram. I will try a new sensor.

Having taken a closer look at the temp guage I note it barely is registering. To me that suggests the stabilizer is shot. I have grounded the wire at the sending unit and it does not deflect the guage.

Well I go the instrument panel loose, but in the process one of the retaining clips for the bolt end of the screw broke. Can anyone confirm the voltages I should be seeing out of the stabilizer? Is 2-3v typical at the sender end of the wiring? The heat guage works fine so that should rule out...

Thanks. There is voltage at the sender, but only about 2v. I will pull the panel and see if there is anything amiss.

I have a 1973 series III with a non functioning fuel guage. I have shorted the wire at the sending unit on the tank to ground and the guage does not deflect to full. So either a wiring issue or the guage itself. Next step to remove dash and look at connections on the stabilizer?