for the fuel pump - i just solved this issue myself - there is a yellow/red wire on the s12 in the driver side front that runs back to the fuel pump relay in the truck. You will need to check conductivity by hooking up a multimeter between this wire and the yellow/red wire on the fuel pump relay (inside the passenger side taillight cover). If you have the correct wire - there should be conductivity. I say this because there are actually two yellow/red wires on the same s12 connector. Once you verify conductivity, you can double check by shorting the one that you think is correct to ground - if the pump kicks on - it's the correct wire. Splice this wire into the s13 ecu wire 104 - the wire is black/pink. This is with an 87 XE and a 93 wiring harness. On my car this s13 wire is also used to switch ground on a relay to control power to the air regulator.
as for the spark - do your coils have power? I ran into an issue with my coils not having power. There was an issue with wiring down by the s12 coils not being correct - I basically searched until I found a wire that was +12 with the key on and start and wired the coil to that. See Ti-joeQC's post - I think I did something very similar.
I would also like to verify the tach wiring - the green/black is the wire that runs between the ignition coil, power transistor, and resistor/condenser on the s13 - somehow jump this to the green wire that comes off the tach (pin 14) on the S12 gauge cluster. WIre 14 is on the driver side connection, and I believe is the only green wire on the connector. Its on one of the corners. Anyway, on my car this wire ran down to the area where the ECU was, so I could use a wire out of the s13 wiring harness to jump between them. The wire I used was the pink wire that used to control the PAIRC-Solenoid valve. I cut the wire on the ecu side (pin 102) and wired it to the green wire in the car under the dash (after checking conductivity). The other side I ran into the black/green wire that connects the ignition coil, power transistor, and resistor/condenser. Voila - working tach.
Now if only I could figure out why my idle is so damned high. I'm 99% sure that the air regulator isn't working - Still trying to sort that one out.
