That era of security (VTSS) is built into the PCM itself, and is turned on by the dealer as needed for the options ordered. I've only seen one Grand Cherokee without, and all Dakotas I played with had it. Rams were the only one that had limited activation.
I have a 97 Ram PCM I can send you as a test that does not have VTSS, but you will have to buy one, as you won't have gauges. The 96 and 97s had direct gauge outputs, not over the bus like 98+.
Sent from my Pixel 3 XL using Tapatalk
Paul do yo have any experiance with Skyed ECU Tuning? They claim to be able to turn off the security in the 1998 GC PCM. https://sykedecutuning.com/jeep/jee...-grand-cherokee-security-skim-key-delete.html Seems for his needs the $100 to do this might be worth it? I've never dealt with them not used any or their software.