Rave gear ratio for Eagletree data.

[est1976]

Im trying to set up eagle tree for my Rave, I have a brushless rpm sensor but I dont know the gear ratio? I have a 14t pinion not sure how many teeth on the main gear or how to do the maths to work out the ratio. Anyone know?

thanks Ben

edit : I think it has a 150t main gear, am I right in thinking it has a 10.71 gear ratio (150/14)