Re: C4 wiring/speedo calibration
Speedo sensor is hall effect. Does your speedo have a "hall effect" or "square wave" input? This is the terminal to use. Black wire is reference earth. I believe white is power in and blue is signal out. Don't worry about the pulses, just calculate engine rpm at 100km/h in top, based on tyre size and diff ratio. Jack up the back end securely, spin it up and flip switches until you get it close. You may need to fine tune after driving, to allow for converter losses.
If you're not driving a manual you're really just steering.