Wayne,
You apparently missed this statement in my Renntech write-up while developing your procedure:
"For example, fuel gage problems with a C4 cluster due to fuel tank design or oil quantity/car leveling errors with a Turbo cluster due to engine sump differences were some of the problems to be avoided."
The oil quantity can not be displayed electronically, on the instrument cluster, prior to starting the engine if a TT instrument cluster is used. I believe the TT has a "dry sump" oil system.
Bill
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Pelican Technical Article: Boxster 996 Gauge Cluster Upgrade - 986 Boxster (1997-04) -