tach problem

all4mx

speed demon
Jun 24, 2006
48
0
0
Olympia, Washington
I My car was n/a, then I swapped in the trubo motor. No my tach doesn't work. I know how to fix it with the resistors, but my question is: will the tach not working cause the dyno to be unable to get an accurate rpm reading? I took my car to the dyno to get tuned, and they said they were unable to get an rpm reading from my motor. When I fix the tach, will they be able to get an accurate reading?