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Diff lock actuator. Vacuum or electrical?

Hi Q-Listers,

Reading in this list about 4K/80/90Q with two locking diffs I've got
imagination that all of them has vacuum actuating diff locks. Looking under
the hood of mine '85 80Q I dont see any hoses which leads to the gearbox or to
the rear diff. Only electrical wires. So I am finally confused do I have
electrically actuating locks or I simply can't find hidden vacuum hoses
(engine is very simple carburettor NE so there are not so many of them).
Or maybe vacuum actuators were made for US market only (my car is Euro spec)?

With best regards,

Kiev, Ukraine
'85 Audi 80 Quattro (waiting for rear springs)