Cheers for the info Simon, much appreciated 🙏
Thought I'd be fine with the humbucker but wasn't sure what to expect from the vanson p90. Might try without but add a longish one to the back of a pot that'll be ready to feed up to the bridge if needed so the whole harness doesn't need to be removed again.
Have a tele missing the bridge ground and there is a slight hum until you touch the strings. Easy fix but not got round to it. Makes the big muff even more wild