1995 Windstar Remote Start Schematics?

Hey everyone. I am trying to install a Prostart Remote starter in my parents old van. I decided to get off my butt and do something nice for a change.
Anyways, I have installed these before, but I cannot locate the schematics for this year model anywhere,

I need to connect 12V Constant, and Keyswitch, and Ignition, tach and Ground. I seem to remember that for tach I just loop the wire around the main spark-delivery wire.....but the keyswitch is the problem.....

Can Anyone Identify which ones they are in this van? I am really worried about doing something to the airbag......

You can try this link: http://bulldogsecurity.com and go to vehicle wiring diagrams.

Thanks a bundle AOLFile!