Hello, I am trying to get TunerPro RT to read my 1993 Isuzu NPR/Elf with GM truck TBI. I came across this forum tracking down $85 definitions file at http://www.gearhead-efi.com/Fuel-Inj...Information-85 It is a great alternative to pick-up but messing with pre-OBDII can be tedious...cheers, Hugh Seattle, WA