The Silverleaf VMSPC9 VMS To 9 Pin Diagnostic Port Engine Monitoring is an intelligent data translator that links your USB port to the engine diagnostic connector on your rig, making it possible to use a laptop to monitor your engine. You can read performance and diagnostic information with the special software right on your laptop computer. You receive complete diagnostics, trip information, and a graphing system that can display up to five parameters at the same time. Engine data can be saved to a file and loaded into a spreadsheet. https://www.rvupgradestore.com/VMS-to-9-Pin-Diagnostic-Port-p/vmspc9.htm
Works great.
Sold RV and no longer needed.
$150 plus shipping or local pickup in Palmetto, FL