who owns/uses a LM_2?

Innovate Motorsports LM_2 Digital Air/Fuel Ratio Meter

I have owned it for several years and have tried to use it on and off but just can't get it to work right or work for vary long.

The first problem is i'm running leaded fuel...
The 2nt is that i can install a new o2 sensor and calibrate it just fine. Drive with light throttle and it work just fine(sensor is to close to the end of the header/collector) i run open exhaust.
During light throttle, it's 22+ air/fuel ratio. As i rev it up it start to bounce around 14-15. As soon as i put it in gear and whack the skinny pedal to the floor, it freeze up. Stick at 14.3 and don't move at all. shut it off for a few minutes. start, sensor warms.....then starts reading...full load in gear and it stops reading and show 14.3. After we play this game several times it gets stuck on the warming cycle(99) put a new sensor in, calibrate and the same thing all over again.

Thinks i have done to fix the problem.
installed a HBX-1 Heat sink bung extender (P/N 3728)
Moved sensor above the 9 o'clock position. Ran a new wire from the cigaret lighter socket to its fuse. (only need 3 amps)