TPS percentage is not a native part of the '7747 datastream, and ADX values are usually a fudged range that doesn't always work out to be accurate.

The only TPS value that is in the '7747 datastream is TPS voltage.

IIRC Mark had mentioned that there was a change that could be done in the bin to send out a proper TPS percentage value but it still wasn't 100%correct, just closer than trying to manipulate the TPS voltage value.