In one of the looms off the main loom you will find a 1/8 " vacuum/boost hose that you need to connect to a vacuum/boost reference. I used the nipple at the rear of the intake manifold on the passenger side. In this loom tributary you should also find a 18ga.(?) black wire. You route this black injector lead along the fuel rail and to one of the fuel injectors. Use a T-Tap to connect into the negative side of the injector harness. ( Note: The trigger wire is the negative (-) or PCM grounding side of the fuel injector and NOT the 12 volt supply wire going to the injector.)

On the relay:
Terminal 1 supplies power to the pump and the green activation light and the optional red low pressure light when the relay is grounded by the injector ground lead and the pressure switch senses the preset boost and supplies power to terminal 3.
Terminal 2 is supplied by the wire with the inline fuse holder and should be armed when you turn the ignition switch "ON" and you should use a 15 amp fuse.
Terminal 3 is the switched 12 volt source from the pressure switch and was set from STS to 4 psi but is adjustable using the little allen screw so be careful when you first hook it up until you see what psi activates the system. The pressure switch gets power to it when you turn the system activation switch on and the ignition switch is "ON".
Terminal 4 is the ground signal supplied by the black injector lead telling the meth kit that the engine is getting fuel.

Sure you don't want me to email the Instruction Manual to you?

 

Thanx Mort. I managed to get a copy of the STS instructions and I worked out most of it but there are 2 things that have me puzzled. I have several cut black wires on my loom and not sure which one goes to the injectors. Is it near the end of the loom, half way, near any other wires, etc?
The other thing is the relay. I realise what goes where, just like you explained above. But I think something may be wrong with mine. Would you be able to put a volt meter on yours? I just want to know if you have any volts on terminal 1 when you turn on your ignition and put power to terminal 2.
Would be a huge help.

 

The end of the loom that goes to the pump should have two smaller looms coming from it. The green wire can be used to run power to your boost controller if you wish so that you are only on high boost when the meth system is on. The red wire is power to the pump and the small black wire goes to the connection on the very top of the pump and to the red warning LED to indicate a low pump psi condition.

The black wire to the injectors comes out in a small loom about 2' back and should have the small vacuum/boost line with it.

The relay in my install has power at all times to terminal #2. It is wired with the line with the inline fuse in it directly to stud #2 in the under hood fuse panel. It has a red wire coming out of the loom that is spliced to the yellow wire inside the loom. There is no power to terminal #1 until the relay is grounded through terminal #4 to the injector ground and until the pressure switch senses the boost pressure it is set to and sends switching power to terminal #3.

The green wire coing out of the loom at the relay and pressure switch is attached to the middle spade connector on the pressure switch and the green wire going to terminal #3 goes to the top spade connector on the pressure switch.

Maybe if you put those pics back up I can give you a better idea.

 

Mort, you bloody ripper!!

No need for the pics, that explanation was spot on. You described it perfectly - maybe should get a job with STS and re-write their directions..............

Now I can finally wire it up. Thanx man.