Car Alarms: unknown car alarm, dash panel, steering column

Question
I purchased a used truck and it has a alarm which no person knows anything about it. The only hint is it looks like it says AC II on it and hanging under the dash there is a small display of buttons one to four lit up in greeen and a small green plinking light on the left and red light on the right. Please email me with help if you can.

Answer
Well, to be honest this is a new one for me.  The AC II is not ringing any bells for me.  I would recommend taking down the dash panel under the steering column and finding the brain of the alarm to get more information from it.  Once you have that information we can find manuals, local dealers, etc.