8-position computer chip for 1988-2004 Ford vehicles. Cable switch required to access positions 2-8 (pt# ch-4001).These "made to play" computer chips have the ability to contain up to 8 programs (low octane, track octane, valet, NOS, etc...). With a simple twist of a knob, you can switch from one program to the next even while the vehicle is running. A single chip covers all "chipable" Ford applications from 1988-2004. There's no need to purchase more than 1 part number. Each chip is reprogramable that allows it to be used more than once.