There might be something here: https://continuouswave.com/ubb/Forum1/HTML/021372.html particularity post #1. A device that displays 4 OBD parameters.
https://www.pacificp.com/forum/viewtopic.php?t=8128 suggests serial data to the instrument cluster.
https://www.scantool.net/forum/index.php?topic=4670.0
Tow/haul is listed here: https://www.palmerperformance.com/support/supported_vehicles/gm_enhanced.php
https://www.pacificp.com/forum/viewtopic.php?t=8128
https://www.pacificp.com/forum/viewtopic.php?t=8128 suggests serial data to the instrument cluster.
https://www.scantool.net/forum/index.php?topic=4670.0
Tow/haul is listed here: https://www.palmerperformance.com/support/supported_vehicles/gm_enhanced.php
https://www.pacificp.com/forum/viewtopic.php?t=8128
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