You need the valve in servo pipe on a boosted engine. It's a one way valve so it stops you filling the servo with boost and giving you a hard peda Coming along nicelyl
Could also grind 1 touth off the 24 touth wheel and used only use one vr sensor to control the engine sequentially. But having a actual crank sensor will give you a more reliable signal
You only need a cam signal if your tuning your coils in sequential mode. I suspect you will be doing this as it gives the coils more charge time. Your best bet for a cam sensor is use the single touth wheel in the original engine speed pick up.
I had this in my old GT on the passenger side. Failed the MOT on it when I looked at it couldn't see no real way of tightening it up. All I done was got a big pair of grips and squeezed the rail together. That sorted mine out.