Take off the left cover on the motor/tranny, and there are a few screws holding another "case" on top of that cover. The injector is just behind it, remove the screws that hold it in, pop it out, plug the fitting on the intake manifold, and you are set. You can then take off the tank and use underneath your seat for like a small golve compartment or somethin. Another thing you mentioned is how to tell if the injector is bad. You can't. they just go, and take the motor with them when they do. Its not a good idea to keep them on higher mileage peds or ones that have sat for a while. I hope this helps ya man.