I agree, they are worth the money. Mine is optimistic both in ET and MPH. I ran it at the track back in '99 to test it out. The following runs are:
1.) Track 14.17/ no mph.....G-Tech 13.90/103.2
2.) Track 14.17/96.7........G-Tech 13.91/103.7
3.) Track 14.22/96.7........G-Tech 13.93/103.5
4.) Track 14.24/97.1........G-Tech 13.90/104.7
Though these don't actually agree, they are all consistent. With my G-Tech and with my car, I just add about .3 to the ET and subtract about 6 or 7 MPH from the the trap speed and figure that's about right. Might be that G-Techs differ unit to unit and also may measure some cars performance better than other cars. This is my take on these gizmos anyway. If I had to, I would buy one again.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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