i have a speedo that goes up to something rediculous, 80 or something, but this means that oir really doesn't recognise anything below 20 accurately, can i get another speedo guage that tops out at say 50 which will read lower down a bit more accurately and just re-calibrate the speedo sender?????? use the boat for wakeboarding, not flat out very often and certainly not at 80!! its a 97 18ft mariah with volvo 4.3gs if that makes a difference