I think that I still have the box and the instructions from the unit that I put in. I'll see if I can't hunt it down and scan the instructions and post them up here.

It's been a while since I looked at everything, but I don't think that it would be compatible with after market alarm fobs. The unit was built by Isuzu to work with the "Option" button on a stock remote.

I'll let you know what I find.

Here are a shot of mine installed in my garage:


I know all of the wires are long, but I left them that way in case I ever moved and wanted to take the unit with me.