read up on the tach readings.
everyone is different.
might get some interference, some have to wrap more and some less.
Some people do better on the 1 setting, others on the 2.
As for the speedo, it's up to how crafty you are.
I have non stock wheels on my maxi and so I made a bracket that bulted onto my rear hub, and have the magnet on the rear gear.
worked like a charm for me.