Simple question: My Short bus E350 with a 7.3 IDI does not have a tach on the dash cluster. I really would like to have one. Does this engine have a tach sensor built in? I assume it must for the E4OD, right? How can I check, and what is the best method for adding a gauge? If it's got any kind of sensor that will give me an analog or pulsed output, I'd be inclined to just build one myself. I'm an electrical engineering student, and I've got plenty of microcontrollers laying around. Counting pulses isn't exactly rocket science, and it seems like every tach kit I've seen is unnecessarily expensive.