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Mines done the same, I had to get a standard cap with no level indicator and cable tie the old level sensor up

They help warmup time, mines been removed mainly because I didn’t see the benefit of hot air being recycled but if you’re in a cold climate then it may help a lot.

Mine

Check your ignition, (rotor, cap, leads) I had similar on mine and the lead on the coil had become worn and corroded and worked it’s way loose.

Check “partsinmotion” they have most stuff for our cars, also as the starter is wired directly to the battery live you’d need a pretty big switch as the current through it would be high, I’d advise replacing it.

Any 3.5 inch (10cm) speaker should do, the ones I fitted had two mounting points can’t remember if that was necessary but I know they fit.

Like this [ https://amzn.eu/d/3WzqG1P ]