here is the deal I need to know how to do the EFI swap in my 78 mustang2 i dont get if you need to completly change the harness or just add on I need anyones help on this if you could tell me or show me a website that shows you how

thanks ted

 

Take a look at Mass Flo EFI. I installed their system on my II several years ago. I have altered the kit along the years to play nice with my supercharger set up. I eventually had to install a PMS tuner and have the motor professionally tuned.

But Chris over at Mass Flo EFI can get your motor spot on in most cases. Remember that a mass air flow system learns the motor based on the sensor inputs.