can i show off a gear token if it requires me to show off a Gear

Yes — a gear token on your board can be shown off for a "[Show Off] a Gear" requirement.

Show Off is short for "reveal [Object] from your hand and/or pick [Object] from among friendly game objects on the board" (Rule 832.1.c), and a token gear is a gear for all game effects unless the card specifies "non-token" (FAQ 8803). Gold tokens, Bomb tokens, etc. all qualify.

One nuance worth knowing: if the requirement says "a card" rather than "a gear," a token can't satisfy it — tokens are game objects, not cards (Rule 185). The distinction matters only when the Show Off wording names cards specifically.