I was wondering of clean way to read RPM so that i can split the signal for my shift light and my methanol kit

the meth kit requires RPM signal for the controller to bias the boost signal and trim so it isnt pinging under loads like going up a hill

the shift light i want to use is the Raptor. I was hoping i could kill two birds by having an easy way to get RPM signal from the coils for both applications.

Any body have a shift light or RPM bias meth kit? What are you using for RPM reference.