Is EGT probe stuffed?

[macca]

Strange issue that. If your touching the connector and you get a reading. Would that mean your earthing the connection?
As for gauges, I haven't tried Autometer myself, they must be good as you see them on the bonnets of riced up Gemini's and race cars. Lol.
I however would vote for VDO, or McNally then Redarc.

Was a sealer used to install the probe? Insulating it from the exhaust and "earth"

Ive tried then all and only trust autometer in both my patrol and chevy always accurate and never faulted. Its expansive but much cheaper in the long run.

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Have you tried SPA, the one in my car was also in the last and has been in use for 11 years without fault.