Analog computers get (if not mechanical) a rather
low Zuse number (still way above any modern machine),
since they usualy are of small footprint, not very
heavy and not realy power consuming ...
ever seen an EAI 8900 (I think that was the model)?
small, not heavy, not power consuming are all somewhat inaccurate for that
Even a 680 was somewhat larger than a PDP11/20 of similar era
Andy