Getting back to an old topic with some new info.
First of all, RRC didn't have alarms till '92, and keyless entry with a fob came out in '93. So Red Rover should have the module I showed above for the alarm only, but no system for the fob.
I recently installed a compete system on my '91 which I bought from Amazon for $25, called Avital, made by Viper. So far it's been great. It wasn't all that difficult to install, the toughest part was figuring what type of locking system the truck has from the factory as you can really screw it up if you wire it incorrectly, but once I got past that it was relatively easy. I now have remote locking/unlocking from the key fob, with alarm, and options for additional sensors such as a glass breakage sensor and remote hatch unlocking if I want to add them.
Disco2Guy, RedRover and erinw.rrc like this