i just watch mine and i haven't ever gone over 3200

 

I cant stand watching the tach, I shift by sound/feel of the vehicle and keep my eyes on the road. The problem with that is these trucks are still pulling like freight trains up until they hit the redline. Without that redline, its VERY easy to over rev and float valves.

 

go with the 4k kit its a night and day difference form the 3k kit

 

X2, fuels alot harder down low also