Gauges would be identical I would expect. The 123 shares in general mostly common parts between all models. A positive verification would be to look up the part numbers for the two separate cars gauges. At the same time cover the sensor part numbers. I am at least ninety percent certain they are the same. Or there has never been any indication otherwise.

I'd test your waterpump. pull it and inspect the fins. should have nice square edges, not thin or sharp.
in this seasonal temps, your radiator is working fine, just your vehicle is not asking for cool water.
I'd lay odds either your thermostat is not opening, or your waterpump is not pumping.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!