check the neutral safety switch. if the EDM thinks the motor is in neutral, the RPM wont go above a certain RPM
check fuel pressure. if you are TBI or MPI, there are different pressures.
Wiring diagram never existed.
Look for the generic information in the electrical forum. The wiring colors are an ABYC standard. And the wiring specific to the motor in the motor manual
You were told wrong
It didn't show more than 100 because there is no water in the block
With cooling water, your exhaust temp is 200f
Without cooling water, the exhaust temp is 1100f