Lets see...
as stated, 2003-04 Boxsters don't need wiring to the Motronic...stalk to gauge cluster is all, as explained in the tables (2nd table is for 2003-04 Boxsters).
Should be easy for your model
I gave up on cc-mod, as no one really seems to know what to do with a MY2001 Boxster with a 2004 996 gauge cluster...I asked on the pelicanparts website.
My question was: How would i wire the cruise control connector in case of a 2001 Boxster with a 996 2004 gauge - Motronic or Instrument Gauge?
Followup from the Pelican Staff: I have not done the modification on your vehicle with the 996 cluster. It might be very similar, especially if the 996 cluster was plug and play.
I opened a post in our forums. A Pelican community member may be able to answer your question.- Nick at Pelican Parts