I fitted DIS and Cruise over the weekend using the various guides (QJ's sticky, etc) but I noticed that there's a few gaps to catch one out.
One of the things that is rarely explained properly is the Pin 1 'earthing' or washer bottle problem. Pin I is on the dash multi-plug (the Blue one) behind the Tacho NOT the speedo as some guides say, (that's green).
There's a very good post here, by Fourcircle (about half-way down) that explains it in pictures:
DIS retro fitted but button blanks the display
However you DON'T want repair wire 000 979 133 (A, B or E) you need 000 979 009 for the dash plug. As that has a pin 1 female end on it already.
You can use a "twisted end" but for a couple of quid the repair wire is a better bet long-term.
There's a guide to all repair 'wires' here:
Repair wire 000 979 133 (A) is for the washer sensor itself and you need one or two of these. (you can use one, halve it and splice an earth on one half and an extension to your pin 1 wire.
I managed to find a bargain brand new 'R' B7 SCCM and a complete stalk set from a B7 in as new condition.
If you are using a 2nd hand SCCM you'll need to use the learn VIN coding in VCDS. I've read that most (or a lot of) A4 B7's come with a highline module in them so it's worth looking for a 'breaker'. I'd already bought the new 'R' module (a really lucky find) but the stalk set I later found had all 3 stalks and a B7 slip ring and a 'Q' SCCM.
As Ross-Tech imply B7 modules are backwards compatible with B6.
Cruise Control Retrofitting (8E) - Ross-Tech Wiki
I didn't have to wire the SCCM to the Engine Control Module (I believe this was for early SCCM's). It worked once the engine was coded for cruise (adapted login)
I bought a complete standard cowl set for a tenner and being a tight git cut it to suit 'cruise':
You really need the indicator stalk off the car to do this accurately, to line them up and take the relevant measurements.
Measure centre to centre of the two stalks and then a semi-circle about 19mm, i did it by 'eye' with a soft pencil!
I just drilled inside the outline and cut it out!
File or dremel out the remainder and keep trying it. The cruise stalk actually needs to sit slightly lower than the 'arc' of the indicator cut out to allow the top and bottom cowls to fit tight together.
30 minutes and saved about £25-30.
I'll extend this when I've sorted my pictures of the washer bottle sensor install.