Do any of you have a sure fire way of telling what gear ratio is in a 912UL? I see that they could have come as 2.27 or optional 2.43. From what I can see so far I could turn the prop and count crank revs VS prop revs or pull the gear box down and count teeth. Is there an easy way to count eng revolutions? I have minimal space between the firewall and the eng and can't see the crank.