I have a 1998 Marquis, and have had the transmission re-programmed twice. The connector for the Allison is in the dashboard, under the removable panel just in front of the steering wheel. The last time I had it programmed, the tech came to the coach, took a look at the connector and said "oh, you have the old connector." He went back to his shop and came back with a different cable and re-programmed the transmission. I have mine stay in whatever gear I am in when I switch on the "jake brake". So, if I am in 6th gear, it says there. If I want to go lower, I do it myself. Works great!!