91 yota tach questions
 

where do i wire up a tach on a 91 pickup with 22re?

Negative terminal on the ignition coil is where I ran mine to.

Rob

That will run the gauge to tell my rpms?

On most (mine at least) you have to run a wire to the negative side of the coil and a wire to a light source to give the tach lighting, and a ground. That should be it.