1. yes
2. yes
3. this is the altitude compensator do not connect to vacuum, leave as is.
4. yes, this is why i have the 4spd. model they are so simple..............these answers are for 79-81 240d manual, others should be similar

good luck with the project

__________________
Gretchen 1981 240D 4-spd 213,000 mi
1979 240D 4-spd 298,000 mi parts car

1994 BMW 325is
1991 Dodge turbo diesel
1997 ford expedition

BILL