Yo,
See what I posted in my previous reply @
http://blogarchive.brembs.net/cars/maf_conversion/
EXCERPTS:
"...I also got a wiring harness off of a 1989 truck, a computer connector and the A9L computer from a 89-93 Mustang. The idea was to take the intake off the truck, remove the engine wiring harness and replace it with the parts from the project to have a MAF truck with a single intake tube and a performance mass-air sensor.
The most tedious job is to make the wiring harness. First I had to strip the entire harness from the 1989 F150, clean it and make sure all the connectors matched. In addition to the sequential injector wiring, the connector for the mass air flow (MAF) sensor needs to be wired into the harness. I simply split the signal of the single oxygen sensor in two to simulate two sensors as required by the A9L computer.
To get this done, I first had to take off all the wire stumps from the spare connector that came with the A9L:
That is rather easy, if you take out the red H-shaped bracket and then insert a small screwdriver (see Leatherman Wave above) into each pin to remove it. I'll re-use some of the pins later!
The extra connector came in handy, because the old connector had a plastic cover that would've needed modification to move pin locations and it provided me with spare metal inserts for the pins. All I had to do was switch all the pins over to the new connector. The left picture shows the beginning of the process with only a few wires in the new connector. The right image shows the final result: all the wires are transferred and the remaining parts are combined to another spare connector (on the right side, with the H-bracket inserted and the black cap over the blue plastic cover).
During the soldering and wiring process, I double checked all the connections with the wiring diagram of a 1990 Mustang. You can see my printout of the diagram on the left image above. Note that the injectors will be wired slightly differently, as the firing order for a Mustang is different from that of the truck (see above).
During the wiring of the wiring harness, I discovered that pins 23 (knock sensor) and 24 (power steering pressure switch) are not used in the Mustang A9L. For now, I have left those pins unoccupied. If the Mustang doesn't use them, it should work with the truck, too. It simply means I might have to depress the accelerator somewhat to turn the steering wheel when the truck isn't rolling and I can't advance the timing too much, if there's no knock sensor automatically retarding the timing. We will see how this turns out. I also moved the air charge temperature (ACT) sensor from the lower intake manifold to the intake tube.
This is what the harness looks like in its final form with the A9L Mustang computer:..."
see pics and read more