I'm in the middle of hydraulic steering install and am wondering how you accurately determine the crankshaft centre-line on the drive. I assume this can be done without pullling the drive and there's probably an easy answer... so, what is it? Thanks.

If it is a Bravo or such, the crank center is the center of the main tilt pin, which has potentiometers on each end on the stock drive, or stainless steel pin retainers on the HP

Brownie, it is a Bravo One and are the potentiometers the circular part that looks a bit like a rubber cap that are on the side where the drive pivots and tilts up? Thanks for the help.

Yes, it is actually black plastic.