4 5/8" Cutout size, Overall size 5" Know your boats most effective drive height, trim angle and propeller size to gain more speed and increase fuel efficiency. Inside the DataTachTM is a computer that receives GPS speed & RPM info and it calculates the slip of your boats propeller. It does this 5 times per second, to give you an accurate reading.The Livorsi DataTachTM Prop SlipTM Multi-Gauge is offered exclusively at Livorsi Marine Inc. Large easy to read LCD digits can be seen in direct sunlight. Fits into a Monster GPS cutout. Available in a Mega or Race rim in 13 brilliant colors to tie into any existing dash. Available for in-dash or portable version. A few things that affect prop slip...Pitch of propeller,Propeller size, Condition of boat bottom, Condition of propeller,Engine mounting height, Weight distribution, Jack plate mounting and Trim angle.
Kit includes Gauge, Recall Switch, GPS Receiver/ Antenna.