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I think you'll find the travel on a jet boat steering wheel will mean you won't need it as much....but it would be nice as a reference to know where the center point is!
Done! Only difficult part was drilling through the stainless steel spoke. Make sure you have a good quality drill bit. I purchased the knob off ebay for $11. not as nice as the one that was on my boat but will get the job done. This one spins on plastic bushing as apposed to pressed in bearings. I believe the knob with the bearings run around $75. Looks like I need to wipe the wheel down 
