See people who are fascinated by machines like computers, cars, bikes, robots. They adore engines, hardware the visual looks for them the smell of it, everything about it.
Such people are hardware maniac.
Learn English – What do you call someone who’s fascinated by machines
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Best Answer
From Merriam-Webster...
More informally, there's gadgeteer, gadget man, gadget freak, etc. (gadget - a small, unique-use mechanical or electronic device).
Personally, I often also use propeller-head (often disparaging: an enthusiast of technology and especially of computers), but that may not be so common among Anglophones in general.