Anyone know how to wire this type of button

[TheShaner]

Pac man start button ...  A B C post with C in the middle at the bottom

[Fursphere]

Got a multi-meter?

[MajorHavoc]

From your description, it sounds like you have a SPDT switch (Single Pole Double Throw).  One of the contacts is normally open, one is normally closed and the third is ground.  You will want to use a meter or other means of testing contunity to identify the normally open and ground terminals.  Follow the link to a slideshow that will take you through the terminal identification process (the good stuff is about 10 slides into the show).
 http://www.wisc-online.com/objects/ViewObject.aspx?ID=DCE7604
(You may have to copy and paste the url to your address bar but it should answer your question.)  :-)

[michelevit]

2 pole switch.
1 common
1 NO (normally open)
1 NC (normally closed)

[PL1]

Single pole double throw (SPDT) switch.
1 common
1 NO (normally open)
1 NC (normally closed)

FIFY

Swing arms = poles.
Positions = throws.


Scott