I recently purchased a 5" autometer autogage series tachometer with shift light and ford racing tach driver for 80 bucks. Does anyone know how the tach hooks up to the spi? none of the local fj and focus enthusiasts have any clue how to hook it up since its not a duratec or zetec. I did a little research and found that some of the wires hook up to pcm pins 21 and 22 or ecu pin 48? What does this mean? I can figure some stuff out with hayne's repair manual, but I really need your help on this one. Thanks in advance!