Question for those who have pyrometers. Installed a dual pyrometer from Gaffrig two seasons ago, and can't get it to even register. $300 dollar gauge and a large hole in my dash for nothing. Installed it at the very top of the mid section just below the power head and ran the wires cleanly up to the dash. Hooked the ends up per the instructions and never could get any reading on it. Minimum degree number on gauge is 600. Set up is a 2.4 carb bridgeport running 155 psi per cylinder and 92 jets. A qualified high perf Merc mechanic told me that the motor may be too rich making it run cool, but I find it hard to believe that it wouldn't even hit 600 degrees? A friend with a hi-po OMC has the same problem, no reading. Help?