Hi Jerry,
I have tested it with my GPS Speed app on iPhone and against the radar speed signs on our local high ways... both agree so the iPhone app seems to be correct. I also tested in in my Jeep and it's correct. I'll get several more readings today and call them in. The shop that's worked on my speedo is a block away from Bob's Classic Chevy...they know what to do.. They build the adaptors for them. Best to have several readings, I agree. Maybe it's Jim Carter...I forget
