Come The EMP /nuke war you'll be glad you didn't ditch the old donk, and find that you can quite happily drive over all your neighbours' newfangled dead electric things while shovelling coal into the boiler...
I couldn't really comment on turbo temps, maybe @MB ?
My TD42 pull uphill at ~415 degrees, Probe mounted on collector point at manifold, under heatshield, between 3&4 cyl, basically where maximum turbulence and all cylinders will be counted. If I let her lug up at low revs I can push 620, which is near piston-melting temperatures.
Turbo EGT temps will depend if pre- or post- and upside-down-sideways mounting, plumbing, and probably a few other things.
Gauge not registering suggests, mismatched thermocouple/probe type? Faulty electrics? probe wired backwards?
-edit-
my (digital) gauge reads from 0. idles at 95-110 depending on ambient, thermostat/cooling open, air filter blocked etc.




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