Hello Ben,
Your running temperature should be in the low nineties when the car is moving. When stationary it may slowly rise to a maximum of 100 degrees.
The specification of the thermostat is that it begins opening at 88 degrees +/- 2 degrees and is fully open at 96 degrees.
Temperatures in the low eighties suggest that the thermostat is stuck open. I'd suggest that you change your supplier to a recognised X-Part dealer.
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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