The Hairy Camper wrote: ↑11 Mar 2024, 13:45 That could be useful. Does it involve tapping into another wire, or do you need to mess with the blue plastic circuit?
I think I'd rather mess the aftermarket tachometer than a 40 year old circuit board.
Where have you taken the feed for the light from, just use the original one then when you 'turn it down ' the tacho will dim accordingly. The switch simply reduces the voltage down.