I plan on upgrading my fuel system from the SFMU to the Megasquirt ecu. I wanted to know what else i need for install of the megasquirt, Like 1:1 Ratio regulator, and return my fuel system back to stock, would i need anything else?

You would just replace the SFMU with the 1:1 regulator. You still need the return line and the factory regulator cant be used.

u may want bigger injectors if u dont have them already