Vw called it an "Autostick"
The 3 speed box is a manual shift like any other vw.
There was never a full auto in a beetle.....this Autostick is as close as the beetle ever got.
Functionally it had NO clutch pedal.
The vacuum servo workes a small clutch for you. The vac servo is actuated by a switch on the stick shift lever. The switch is sensitive, just the weight of your hand on the stick will activate the clutch.
It will idle in gear at a stop light because it has a torque converter much like a full auto would.
So you would put foot on brake.
Put hand on shifter.
Select first gear.
Remove hand.
Let off brake.
Apply throttle
Drive off in 1st gear like and automatic.
Get done with first.
Put hand on shifter.
Select next gear.
Remove hand.
Apply throttle.
Get done with 2nd
Put hand on shifter.
Select 3rd gear.
Remove hand from shifter.
Continue in down the road.
Come to a stop light.
Stop and wait until time to go like an automatic.
Press the throttle.
Forgot that you left it in third gear.
Put foot on brake.
Put hand on shifter.
Select first gear
Remove hand from shifter.
And take off again and repeat.
How it works
The torque converter runs on auto trans fluid. It has its own tank and oil lines. The pressure pump for the hydraulics is piggy backed into to engine oil pump. It is a specialized pump on for the Autostick....and rare and hard to get
The clutch works on vacuum. Micro switch on shift lever turns on a solenoid valve. Which draws a diaphragm that is connected to the throw out lever. It also has its own vacuum reservoir tank and hoses.