A local 996 owner sometimes comes over when we work on cars. I forgot he did toolpants.com a year or so ago.
If your car is out of warranty and/or it did not come with top when it is built then the dealer will charge. Can't tell what the problem is but the DVD might help.
As for the trip computer, I have done over 30 of them. We filmed 3 installs, with the switch and with the stalk. Jeff
http://www.vssi-eda.com/9x6werks/
http://www.vssi-eda.com/9x6werks/