New to me 1994 M1081 LVAD (and I'm new to LMTV only drove M35s in 90s), no fault lites with warm up. I press "D" once but can only get it to go 10mph. I tried manually arrowing up the gears but No Joy. When I press "D" once I get the "7" in the left indicator box and "2" in the right. What am I forking up?