tach question

[nomaboy]

which sensor gives the computer and the tach information on what the rpm is?
thanks
BTW it is for the truck listed below

[Hammer Head]

It's done off the distributor.

[Joker2040]

Why do you want to know? If you are hooking up an aftermarket tach and you want a RPM signal the easiest is the negative side of the coil. OR If you have a MSD ignition it should have a tach output on it.

[rat]

If your factory tach isn't working it is like said above, the camshaft position sensor on the bottom of the distributor.

[nomaboy]

well my high end missfire came back so i was test driving it and noticed that if i can get it past 5000 rpm whithout it misfireing (done useing part throttle instead of full throttle) then the tach jumps around. so i figured the same sensor that gives the tach its signal probably gives the computer signal too which could cause a missfire.