The stock drive freq setting is 1.5and I normally run a 8 or 9 turn mod with a 4.1 drive freq. A 6 turn will have a ton of power to begin with and running the drive freq that low with that motor may be placing too much of a load on the speedo. I'd also check to see if the gearing was correct on the motor along with the timing set on it. The two times that one of the driver's out here has had a 6 turn in their car we only had the timing set a 5 degrees. Hopefully you didn't damage your speedo and it works for your big race. Good luck!