I recently purchased my first boat, a used 2002 Tahoe Q5 with a 5.0L Mercrusier engine so I am somewhat of a novice. I am getting an audible alarm and I have read that it could be caused by one of three different sensors, high heat, low oil preasure and low drive oil fluid. The tempature gauage measures 160 - 170, the Oil pressure gauge reads 50-60 and the drive oil fluid level was high so I removed some to get into the correct range. I believe these ranges are all exceptable. Any comments or suggestions would be appreciated.