Would love to pick your brains about engine wiring.
Ive got a base model mk1 focus 2.0 zetec, ive got a focus rs engine and gearbox to drop in. Id love to be able to use the stock focus rs ecu so i have obd and dash lights etc.
whats the best way to do this? Whats the bare minimum i need? And what pin out do i need to change? I can do the work just the wiring side of it scares me 🤣