David; thank you for the info. I guess I should have been more clear, this is for my '67 Camaro (which obviously would not have OBD). Hoping to safeguard or defend against a repeat of total cluster flip from transport last summer...
Car 'disappeared' for 4 days during transport from PHX AZ to Morgantown PA last summer (& again, even longer, on the return trip). Truck driver had every disaster/excuse imaginable (except for 'the dog ate it' - LOL). I now believe the many disasters were total BS and I got played. Pretty sure it was 'joyrided' during the period it went MIA. Finally delivered at 8:30pm, the night before show start (I had planned for 3 prep days between delivery & show). Judges said underneath it looked like it was driven in the rain! (It was loaded with freshly painted undercarriage & detailed under hood).
If anybody has any suggestions how to keep tabs on vehicle (vintage) during shipment... Appreciate any suggestions!
P.S. alternative is do-it-yourself (2400 miles x2)?? again, any inputs appreciated!