Recently purchased boat with 7.4MPI B3 310HP (200 hours). Owners records indicated two replacements of tilt sensor on outdirve. Is this part a major reliability issue? Other owners indicated same problem along with the usual pitot clogged problem. It again hangs up and is erratic on the top end of the scale.<br /><br />Can a laymen replace the sensor assembly? Can it be accomplished with the boat in the water with sensor under surface? What major assemblies have to be removed, if required, for replacement? Will resistance checks, whlle tilting outdrive, on the sensor output pins work to localize problem?