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I do not know about a Microbus auto gearbox, but the automatic 411 and 412 Variants had a microswitch below the accelerator pedal, if you would 'floor' it it would close the circuit for a solenoid on the gearbox to select a lower gear.
That looks to be a vacuum kick down and will pull a link in the gearbox to allow the box to kick down.
If you floor the petrol, you cause a high vacuum, and this will tell the box to step down one or more gears.
Herman
1952 Split Beetle 1835cc
1968 Fastback 2Lt.type4
1972 Low Light Bay Panel Van 2Lt type 4
1975 Fleetline Panel Van 1914cc
2020 MeFusco Beetle Truck 2Lt type 4
1972 FT Hahn SP 1776 cc
Without vacuum, it should be not pulling, but all slack taken up.
Herman
1952 Split Beetle 1835cc
1968 Fastback 2Lt.type4
1972 Low Light Bay Panel Van 2Lt type 4
1975 Fleetline Panel Van 1914cc
2020 MeFusco Beetle Truck 2Lt type 4
1972 FT Hahn SP 1776 cc