For the speedometer and the fuel gauge you can visit another Khalid in Islamabad. Located in G-8 he is the best electrician working on Volkswagens (and other cars) in Rawalpindi / Islamabad these days.
The thud could be worn out bushing that seats the rear torsion plate. very easy to spot by doing a visual check but to rectify you'll have to visit a mechanic and be forewarned, if it is the bushing that needs to be replaced it may require part removal of the rear fender to access the area. Khalid is your best bet as he performs these 'procedures' almost on a weekly basis. Just day before yesterday I saw him do that on a white 1302.
Good luck