The "neutral safety switch"? There isn't one, which you will appreciate the day your clutch cable breaks and you've got to float gears to get home.
premium 98.
It's on the passenger side of the transmission.
As long as the 73 isn't a super beetle then yes they should fit.
No,fuel filters come stock on a bug.
10 gallons.
Yes
Oldsmobile Cutlass/442
see http://www.thesamba.com/vw/archives/info/wiringt1.php
the starter is under the car if you lift it from the rear you should be able to see it close to the rear passenger tire hope that helps
yes
Search for a fuse diagram online. If one is not available, then a service manual can be purchased to find the layout.
If the 71 is a standard then yes it will fit.