Trigger wheel diameter

[strikerrich]

Hi there,

I am thinking of installing megajolt to my cvh engined kit car.
What diameter trigger wheel should I fit? I was going to get a 3" dia one from triggerwheels.com and bolt it to the front pulley. Does this sound ok?

Does anyone know of a rolling road tuner who has experience with these systems? I don't know anything about mapping!

Any help is gladly appriciated.

Rich.