Looks great, my guess with the rev counter is the instrument itself, swap for a known working item. Steering is very heavy on Mk3 and 4 but if wheels are in air should be smooth. No special proceesures for rack really, just check the inner and outer ball joints for slak/play. If its stiff just get another one and fit that because yours will be worn if used in that condition for any lengh of time I would have thought.
Good luck with it - you have done a nice job!