Posts: 3480
Location: Elk River, Minnesota | Hi Dave,
Props are actually boat and motor specific in that no two boats with the same motor will act exactly the same way..so...finding the right prop for what you want your boat to do is a matter of trying different ones. Usually what happens after some testing of different props, one will stand out and perform the best for everything, including hole shot and top end, along with good handling. The right prop will allow the boat to just float along at cruising speed (not wide open) and handle without any issues.
Most larger motors have a tube that runs out of the lower unit (usually close to the front of the lower unit by the shift linkage if you can see it). There is a hole below the cavitation plate that it will go to (which is what you found), then that tube goes up to the speedometer. Most of the time, the speedometer set up to work via water pressure is not extremely accurate and can sometimes be quite a bit off...so a GPS will give you a more accurate reading on what is really going on.
Pretty big learning curve isn't it... 
Steve
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