I did the tank on my Tenere about 2 years ago with 3M Ventureshield. I'd show you some photos, but you can't actually tell it's there! It has done it's job admirably.
I just got the tank kit which covers the sides by your knees, the top and both the parts that extend forwards. It is easy to fit (if you take you're time).
I paid �35 back then, but it's �40 now. You can also buy a complete kit that covers the headlight fairing and the front mudguard, which I thought unnecessary (especially as the complete kit is �80).
Tank kit available
here.