Bit of an update. I have always been told that because of the way the battery charges, it's always best to have the lights on when starting the car, so that's what I do. Invariably I just leave them on then. However, today I decided to turn them off and noticed something a little confusing on the gauges. With the lights off the temperature reading dropped 5/6 bar and the oil pressure went up 5/6 bar. For the rest of the time I drove it, not a warning light in sight and the readings appeared a lot more in line with what I would expect.
So my question now is, why would having the lights on affect the gauge readings. Presumably something to do with the electrics?
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