You need to get an aftermarket keyless system since the factory keyless was built into the radio. If you still had the radio it could be salvaged but not without it. Aftermarket systems go for about $40, domelight is just a matter of jumpering two wires. Domelight supervision with keyless is a matter of wiring a relay. So basically keyless hookup is:

Power
Ground
Lock (green/white)
Unlock (green orange)
Domelight supervision (relay - power, ground, and keyless brain signal)

This is a picture of the driver's side fuse panel