I bought a custom wheel from
www.triggerwheels.co.uk (or .com can't remember). Bolts straight to the fron of the crank pulley, comes with two spacers as well.
As for the VR sensor - I'm using a ford one and making my own mount from some alu sheeting and using the two block bolt holes at the right of the engine (as you look at it from the front).
VR sensor needs to be about 0.5mm from the trigger wheel as far as I remember.
As for mounting it relative to the 36-1 config, see the MS website they've got all the numbers on there (or
www.extraefi.co.uk - tha'ts where i bought my MS from and it has some very useful info in there).
hope that helps a wee bit