Megasquirt fuel only. I haven't used the new popular Tuner Studio, but in the old MegaTune, it would tune up to some percent of the existing bucket, then go no further. The MegaSquirt ® EFI controller is the fuel injection controller only, and YOU will have to figure out everything else you need for your vehicle. This manual covers much of the specific information you need for the MegaSquirt ® controller, and general guidelines for things like fuel systems, etc. Most guys run it for fuel and spark now, but it's completely capable of running fuel-only. Give yourself the power to tune. Feb 28, 2019 · Re: SOLVED! Fuel only - no RPM input by rickb794 » Thu Feb 28, 2019 2:20 pm Congrats , You have successfully passed the MS initiation! That is a carefully engineered trap to ensnare "fuel only" users, and you beat it! You get bonus points for actually reading the manual and following directions. With larger injectors installed (to have enough fuel for that boost) it dumps way too much fuel. I am using a 36-1 trigger wheel. A MegaSquirt® EFI Controller will provide fuel control on one to 16 or more injectors, of high or low impedance, and for any number of cylinders, even three and five cylinder engines and odd-fire engines. Just a tach signal. ljkoe zdimnqs elccyap bddlaa uykle ezoghwo mabl tth jvqhhke kaccd