For charade go to plaza market chat wali gali, inside there is a shop in last who holds charade mechanical parts as well as lights and other interior parts.
as for mechanical fuel pump, do search in the same gali, there is a shop who deals only in fuel pumps....u can search there also.
Shershah mai parts milengey but not in good condition because 81-82 charades have a severe problem of rust thats why they end up in shereshah in bad condition.
pls share pics of ur ride.
as for wiring, change the whole loop if there are many joints. it will cost one time but it will save future expenses