You have no idea how many people are giving you a standing ovation from their corner of the internet for stating that you're reading the manuals and learning.
FYI, all of your fuel delivery system is going to be mechanical. The fuel lift pump is mechanically driven and the injection pump is also mechanically driven. The only electronic control portion of it is going to be on the injection pump, which is the assembly that times the engine, meters fuel for current throttle/load demand, governs RPM, and creates the high fuel pressure needed for the [also mechanical] fuel injectors. The only electronic components on that pump are two solenoids: one operates as the fuel shutoff, and the other controls timing advance in order to help the engine warm up on the initial starting.
Your throttle cable is going to connect to the pedal, pass through the firewall near the top-right, loop up over the engine and back downward to where it connects on the left-side of the injection pump, connected to the throttle linkage. There's a bracket also attached to the left-side of the injection pump that the throttle cable sleeve is bolted to, which can slip out of the bracket if it was loose and cause throttle control failure. The assembly can be adjusted to remove the slack in the throttle and then you can follow-up by adjusting the idle screw on the injection pump throttle linkage to ensure that the engine idles at the proper RPM when warm.
