Bumping this thread... I have an old TM2 on my Volvo 760 Turbo Diesel, and my Turbo Diesel Isuzu Trooper expedition rig has the new and improved TM4 model. This device has saved engines for me numerous times, I consider it an absolutely essential safety device (for the passengers & vehicle).
A good engine monitor let's you fix problems like a coolant or oil leak before they destroy the engine and leave you stranded in the middle of nowhere!
1986 Isuzu Trooper Turbo Diesel
1984 Volvo 760 Turbo Diesel