Arcade wheels fall into two categories (mostly).
Optical (hooks up with Optipac).
POT based (hooks up with an AKI board).
There are quite a few different pedal designs, some of which are unusable*. But most of them just have a POT in them and can hook up with an AKI.
There are also assorted hacks available as well.
*Some pedals are optical and have a certain amount of positions (like the Turbo one), as far as I know these are not usable in Mame, unless you modify them to either turn a pot or press a button.