I just bought tha VMSpc this morning. It is installed and working except I do not get an indication of the transmission gear selection. The indicator for gear selected and gear attained are both ? question marks. Bill Day '98 Holiday Rambler Endeavor Cummins ISB 275 Allison MD 3060

Submitted by Biker1956 on Sat, 2010-03-27 12:50


Did you right click on the guage and made sure the 2 boxes are checked? They will stay ? marks until the engine is started. Larry

Submitted by Anonymous (not verified) on Sat, 2010-03-27 16:22


Both boxes are checked and I started the engine and info from the last trip was entered into distance fuel time economy, but no grar positions Bill Day

Submitted by Martin Perlot on Thu, 2010-04-08 12:15


If you have the old 2-digit shifter that shows the gear selected AND the gear attained, then you won't get that data on the VMS. Allison simply did not program those trannies to share that data.

Submitted by Anonymous (not verified) on Tue, 2010-06-15 20:53


I have a 2001 Dynasty with the "old style"indicator. That is both the gear selected and the current gear show on the tranny selector. When I first hooked up my VMSpc all i got was ?? for tranny info on the VMCpc. Recently had the tranny serviced for a check light and they found whatever electronics connects the tranny for info was not working. Now the VMCpc shows gearing info despite the fact it is still the old style tranny indicator. Who can figure this out???? Now I am wondering if the VMCpc should be showing a lower gear when my newly repaired engine(compression) brake is on?...Cause it isn't!!!!

There are lots of mysteries with your rig. The last one - the brake - is a matter of configuration. Your Gear Selected should be reduced when you hit the brake. The Gear Attained might not because the RPMs are often too high to downshift immediately.

Submitted by Art on Tue, 2018-11-13 10:53


Hello Roland Which SW version do you have on your VMS200 unit? [You can find out by pressing-and-holding both TRIP+SPEC buttons, rolling the knob counter-clockways to the bottom of the page where its shown.] Do you have WTEC selected for Transmission type? [Press PROG until you see the VMS Preferences page. Once there, roll down to Transmission, just below engine, and select WTEC if not already done.] Hows that look? Art //