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The clusters which have the Temp compensatin board (1986+) also have the electric speedo, so it is unlikely that you have a comp board.
Normal temp is 9:00 0'clock, below means engine is too cool and ECU, "seeing" that will add a little fuel, as if on a cold start. When I installed a thermostat in my 1988 244 after I got it, the temp moved up to normal and the fuel mileage went up, too.
Next time the temp spikes up, try this: Move the heater slide to full hot, and watch for a needle move. (In your climate, may be best to do at night.) If there is a change, that indicates that the radiator is not removing heat quickly enough.
Have you done the water blast hose cleaning? Engine off, blast from inside to outside?
There are checks for the fan clutch operation, too. But, danged if I can remember them. Someone else will chime in.
FInally it may be the radiator itself. Over time the tubes closer to the bottom get clogged, and loose cooling ability. Find a good radiator shop in ALB and see what they say about repairing yours? Some can handle the plastic end caps, some cannot. BUT - it might be better to replace the rad and avoid the fun of having the upper hose plastic nipple blow off. Makes lotsa steam! BTDT.
Good Luck,
Bob
:>)
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