Step 1: Identify Each wire on the OLM
Single Red: +5v
Single Black: Ground
Single Green: MAP signal
Twisted Red/Green - Red: TPS signal Green: Output to ECU

Step 2: Access the ECU
Unplug your battery, lift the passenger side carpet and uncover the ECU.
You will only need to deal with harness B connected to the ECU. Refer to this diagram to identify harness B (B135)
http://www.ravensblade-impreza.com/modifications/misc/wiring/ecu.jpg

Unplug Harness B from the ECU and locate the wires that correspond to pins 7, 8, 9, and 19 in the harness.

These wires are:
7 - TPS signal
8 - MAP signal
9 - +5v power supply
19 - Ground

Step 3: Tap power and MAP signal wires
Use the supplied tap-in connectors to tap wires 8, 9, and 19, connecting them to their corresponding OLM wires as such:
ECU wire:--------------OLM Wire:
8-------------------------Single Green
9-------------------------Single Red
19------------------------Single Black

Explanation of tap-in connectors:
One side of the connector has a hole that goes all the way through the connector; this is where you place the signal wire that you're tapping into. The other side has a hole that stops about 3/4 of the way in; this is where you place the corresponding OLM wire.
Make sure not to strip or cut any of the wires. Insert the wire to be tapped and the corresponding OLM wire and use a pair of pliers to push the metal peice all the way down. This will actually strip a small part of both wires and connect them via the metal piece. Close the little cover on the connector, and you're done!

Step 4: Splice into TPS wire
The only thing left to do now is to splice the TPS wire (ECU wire #7). Locate wire 7 on the same harness. You will need to cut and strip both sides of this wire leaving yourself enough length on either side of the cut to attatch crimp connectors on either side. You now have two ends of this wire. One goes to the harness (ECU) and the other eventually leads to the actual TPS sensor.

Now locate the twisted red/green pair of wires on the OLM.
Connect the green wire to the harness side of wire 7. This is the output signal from the OLM which will be passed to the ECU.
Now connect the red wire to the sensor side of wire 7. This is the actual signal from the TPS sensor that is fed into the OLM.

Step 5: Put it all back together
All the wiring is now done. Re-connect the harness to the ECU and tidy up the wires (zip-ties anyone?). You can place the OLM anywhere you like... the wires should be long enough to make placement very flexible. I suggest putting it in the space bellow the glove compartment and attatching it with either zip ties or some double sided tape.

Close everything up, reconnect the battery and start up the car. If you a CEL appears, you have probably wired something wrong. Shut off the car and carefully re-check all of the wires. If no CEL appears, the OLM should be working properly. If you want to absolutely make sure that everything is working, hook up your stock boost control system and go for a drive. You will notice that boost is no longer limited at part throttle like it is in a stock car. Go out and enjoy your new found throttle response and safe part throttle full boost! :)

NOTE:
I've discovered that when the ECU is reset with the OLM installed, some cars experience a rough on/off throttle transition. I haven't tracked down the reason this occures, but I think it has to do with the way the ECU adjusts to variances in TPS sensors. After a little driving.. I'd say 10-20 minutes, the ECU adjusts and smooths everything out. It does feel weird when it happens, but it ONLY happens for the first ~10-20 miles after an ECU reset. After that it becomes smooth as it should be. If it really bothers you, unplug the OLM (patching through the rear TPS sensor) for the first 10-20 miles of driving after a reset. Then plug it back in, and you won't experience any weird transition.


-- Ed