Re: Shifter cable adjustment.
Yeah its really important to get it right or you can burn out the clutches in no time.
Set everything up but at this stage don't connect the cable to the pin on the gear selector on the side of the box.
Manually click the box into 3rd gear (count the clicks) and also put the shifter into 3rd gear.
Get back under the car and rotate the adjuster so the cable eyelette slides easily onto the pin on the gear selector on side of gearbox.
Now put the shifter into 2nd gear and get back under the car and slide the eyelette off the pin and make sure it slides off easliy. Hopefully you won't have to adjust it another turn, but adjust it if it needs it.
Keep checking all the selector positions this way, 1st, N, P and then back to 3rd gear again until you get the best position on the adjuster so that the box selector isn't being nudged by the selector out of position.
You will probably find that it won't match up right in every gear, but make sure 3rd gear is given the priority as the car spends most of its time in this gear. It is usual for Park to not match up precisely.