"Transmission Oil Temperature" is supported on J1708/J1587 Allison 3000/4000 Series Transmissions built before 1998. "Transmission Oil Temperature and Gear Selected/Gear Obtained" are supported on J1708/J1587 Allison 3000/4000 Series Transmissions built from 1998 to 2005. In 2005, Allison changed the electronics in the 3000/4000 Series Transmissions to ONLY support J1939, which VMSpc does not support. It is my understanding that in 2008, Allison has added back in the J1708/J1587 support to their 3000/4000 Series Transmissions. Allison 2000 Series Transmissions are non electronic, and do not support J1708/J1587 or J1939.