The engineering Puritan will want to know that the Webers are a retrofit, a hack for escape from the factory's refractory -- but cutting edge tech in the 70s! -- VW electronic fuel injection. The EFI "brain" was a box the size of a small modern laptop, stuffed with individual transistors, inductors, capacitors and resistors.
No one in North America, it seemed, had any idea how to diagnose an internal fault. The owner's options were to buy a secondhand brain taken from a junked car, presumably there for some other reason, or the Webers. Junkyard brains were refundable, but the several hours installing, testing, and possibly uninstalling were not, so careful deliberation was in order.
Access to the brain, like most engine compartment work on the 914, demanded the sort of agility, strength, and determination required of large-animal veterinarians, with access for most tasks from underneath, wedged as it was in a sort of triangular gap below and behind the seats and ahead of the rear trunk and transmission.