Ive just recently bought my 1st skyline,
But when you press the horn in it trips the boost gauge and horn sounds non stop.

So I'm guessing a previous owner tapped his boost gauge into the live feed from the horn.

Does anyone have a rough estimate to how much a garage could charge me to wire in a separate switch to the horn, as moving the boost gauge what works fine would be more hassle. So just fitting a separate horn switch and wiring to me oem horn would be easier.