Proform 850 dialing it in closer

Cudafever said

The o2 is 2 inch from open collector so the only accurate reading is at full throttle (with a race car that's all i really care about)
The problem is that my radio is dead, and it only acts up at full throttle. Idle around all day long and it won't freeze up!

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My bad on the radio part, thought you had a working one.

Might still be worth checking it with a multimeter at idle then rev the motor and see what happens. If you see it climbing with the revs there may be a point at where the interference passes the threshold of what the gauge can handle and locks up.