playing with an innovative MTX-L (which is the gauge-based wideband), using the ol' ac pressure sensor input trick for logging.

im using 0.05896N+7.35 for conversion, which i calculated myself, then found forum posts from other people that had used the same conversion (just to confirm i wasnt out to lunch.)

i'm getting weird results:

open air (5v) which is maximum reads 22.39 on the gauge AND my datalogger (correct)
the datalogger reads 7.35 afr if i unplug the lead, which is also correct
but anywhere in the middle, 11.1:1, 16:1, the datalogger is approx +1 over the gauge reading.

im pretty sure my connections are OK, i use a ground that's common with ECM ground...

anyone ever run into anything like this?