Mate, it took me a couple of years and a whole lot of coolant to realise it was under dash earth for clocks. The coolant light circuit is on the clocks and the voltage drop of the bad earth triggers the coolant light. I could be wrong, but if your clocks seem dim at night and fluctuatge, then its the same issue as mine, Mk2 90, Alpine white
Check the hex bolt clamping the steering column is tight and theres a ground point on the drivers side pillar nd a earth buss under the dash that you should check connections
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