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Sounds like something is a bit off in the Compensation board. The highest temperture T'stat should have your car running at 9:00. so the fact that it is a bit over begs the question.. Comp. board or clogged radiator.
The "floating gauge from 7:00 to 11:00 leads me to believe it's the Compensation board but you changed the thermostatt and now it's on the High side but consistant.
with the car being an '87, I would think you also have a lot of buildup on the Radiator fins. When I did my Timing belt and had the Fan and Fan shrowd out of the car, I used a garden hose and blew water through the radiator fins from the Engine Compartment outward. just the opposite direction as the wind blows through it. I was amazed how much 'stuff' was in my driveway after doing that. It borought my temp. downa very little bit, it wasn't high to begin with but the radiator was disipating heat better for sure. Give that a shot. easy and painless to the wallet.
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'75 Jeep CJ5 345Hp ChevyPwr and two motorcycles: it wasn't Volvos safety , it was Longevity that sold me
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