Rupp MiniBike gone electric!

[truesprocket]

this is a Rupp I picked up along the way, I had a big Brigs&straton gocart engine on it but the cheap maching sprocket lost it's teeth rather quickly so I put it back on the gocart , but this motor mounted like this leaves lots of room for batteries & I'm going to put the tank back on , advice on controllers would be great, but it's 1.5HP I think so the on off switch should work good for now, wish me luck!