1960 T20s Tachometer Questions

The T20S I am restoring, has had a rough life. It has the tach drive right side cover, and no rear speedometer drive on the hub. There were no instruments on the bike, and the wiring was gone. It has the distributor, still mounted. Does anyone know if the S series came with a tachometer only? I also need a new exhaust header pipe, and have been told, there are 2 different pipes. One for a tach drive cover, and another for a non tach drive cover. I would appreciate any and all information on these bikes from you guys familiar with this model.