for the rpm pick up you can mount it on the front side of the motor mount
not the brake disc side , use only one of the of the small screws
and angle it down to get it to pick up a signel from the back of the flywheel
if you have a colored wheel ( mugen purple) take a dremel or file and
remove a 3mm line of the purple anodize , if silver fly wheel paint a
flat black line