How to wire this 12v switch
It looks like you can control the LED of this switch separately from the actual switching.  If you apply +/- on the &quot;3&quot; contacts, then it will light up the LED on the switch.  Then &quot;1&quot;/&quot;2&quot; are the contacts for the switch, simply giving you an open/close.
Unfortunately, it doesn't look like it is what you wanted if you were looking for a 3 position switch.  It can be hard buying switches without fiddling with them first to make sure it's what you want.