H.O. 4.0 into 87 Comanche with 4.0

I have an 87 Comanche with a tired 4.0 and blown BA 10 tranny.I bought a 4.0 out of a 95 XJ. I want to also get an ax15 with a 231.I was wondering the easiest way to wire it.Can you run it on a computer from 95 Xj which I would have to find. And would the guages from my comanche work?  

That sounds like a good plan. There are two routes you could take depending on how comfortable you are with wiring. The easiest way would be to contact Hotwire Auto: http://www.hotwireauto.com/ with the engine swap details. They should be able to supply you with, or modify a stock 95'XJ harness to get the H.O. (95') motor running in your 87' MJ. The other route you could take involves modifying the 95' XJ engine harness yourself. If you do this you will have to invest in a couple of factory service manuals, one for your 87'MJ and one for the 95'XJ. Try ebay or amazon. These will include a break down of the wiring on each Jeep and should allow you to modify them to work together.

Either way you go I think most of your gauges will work, but I am not sure if all of them will work having never done this myself. I am betting the 95' harness and your 87's wiring can be made to "talk" to one another fairly easily and fairly well and they may even share common sending unit part numbers for example for engine temp, oil pressure, etc???

The AX-15 is a much better tranny than the BA10 and should be available rebuilt locally (for less $$$ than the BA10) as they were used in many Jeeps for many years. Ditto on the NP231. By the way 231s are easy to work on and rebuild yourself.
Just make sure you have a good set of snap ring pliers!  
P.s. I am not Dr. Vern (but I am happy to take credit for his writing!)

Thank You for the info!