I thought only the PC V was compatible with the Tenere ... but I may be wrong (and certainly is obviously)
As I wrote before, I think you are trying to do too much, too fast.
Take your time, document yourself and I would recommend:
- not starting a work on the bike late in the day, but preferably early (shops opened, help available, clear mind, ...)
- get all the documentation before and read it thouroughly several time (including workshop manual, owner manual, part documentation)
- before unplugging anything and installing a new part, verify that you know what is where and how. Make sure that anything you do can be undone/fixed.
- search the forum for identical work carried and read the threads to benefit from other users experience.
- using a explicit title for your threads like : Where's the TPS conenctor on a Tenere or - Trouble fitting Power Commander on Tenere. "please help" doesn't help anyone and will not make your thread easy to find for future reference. Think that your threads should also help others and be easy to find.
- searching before starting a new thread: Watch this
http://www.albinoblacksheep.com/flash/posting
As you said, you've been away from bike for a long time.
I would humbly recommend familiarising yourself with riding the bike and carrying basic maintenance before attempting performance modifications.
aka: chain/sprocket care, oil/filters replacements, suspension settings, brake maintenance.
The bike in its standard clothes fits 95% of its users. Including some very advanced riders.
The bike has been built by engineers and I believe that engine modifications should only be performed by informed professionals.
I personally do all my work on the bikes on saturday mornings and I'm done by sundown.
I do not always manage to do everything I planned, but I make sure that I have time to stop/re-assemble/get the bike running before sundown.
Then there's always the day after or the next w-e to complete the work.
but that's only my 2cents.