Offroad-Express

There are normally electrical connections on the 4JB1 injector pump in a manual truck
I have added #1 which was on the 4JG2 in an auto truck.
In the auto truck that I have taken the dead 4JG2 out of and installed my good 4JG1 there is no connection for the one marked #4
Does anyone know what each of these do ?

here's my best guess im pretty positive on number 3 though.

number 4 looks like the idle speed up, it would normally be hooked to a cold start switch etc on the dash or depending on the age/model the coolant temp circut which would close it again once operating temp is reached, and also if the vehicle had A/C it would increase the idle.

number 3 is the fuel stop. this will need a feed from the ignition when in the ON position. it will allow fuel to flow until you turn the key off.

Number two looks like the signal for the tachometer.

this pump was bolted to an engine with an auto, as that looks to be the TPS for the auto trans ecu.