Start by dropping the gas tank.
free diagram step by step at www.jeep4x4center.com
A computer from a 1992 Wrangler with the same engine is what is compatible.
Yes, it was the exact same engine used in the wrangler in 1992, although if you didn't already have the 4.0 you will need an adapter to the transmission, or replace that too with an ax15.
They didn't make a 1996 Wrangler...
W/ a new one
it will fit no problem