I am quite impressed with your knowledge of electronics after reading the thread you started regarding how the tach amp works; anyways, do you think it is possible to make a tach amp that takes one pulse from the crank and sends four to the tach? If possible, what is the best way to go about doing so? The 300sel 6.3 V8 tach is the only type that will fit in my car. So if it can be done, regardless of difficulty, I would like to make an attempt to make it work

Also I was wondering how the late model diesel tach works; I know those read off of the flywheel instead of the crank but I am not sure how it reads 100+ teeth and converts it to a pulse for the tach.