The snap on mt2500 can pull live data from the amc cec used in the cj's and yj's with the 258 and I'm pretty sure it can do it for the obd jeeps as well with the proper cartridge and cable.
I've got the user manual for using it with jeeps at work.
I'll check it tomorrow to see if it mentions anything specific about using it with obd jeeps.
Incompetence in motion
96 XJ 4dr, 4.0, AW4, NP231,
87 Wrangler, 4.2, TF999, NP231