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I have one of the old style Gtech's, not the new pro....they are pretty cheap right now...
They're darn accurate when it comes to 1/4 mi speed and time. I had mine running at the track and compared slips back to back. Within one tenth and 1mph...you can't beat that. I'm sure the new ones aren't any worse.
The hp/torque charting might not be great but for an idea of what you're putting down for hp and speed...its worth it rather than hitting the dyno every mod you get. JMO