Viper 300 Classic alarm and Factory Horn

[NismoPC]

OK. I finally gave up on trying to get these damn facotry remotes to work with my G20. So, I installed my vintage 1992 DEI Viper 300 alarm with door lock, trunk release, flashing light, etc. and it works like a freakin' champ. The remote even has the original battery from it.

1. Is there a way to connect the factory horns to the alarm (+) siren output?

2. Do I have to disconnect anything from the factory alarm so it will not interfere with the aftermarket alarm?

3. Anyone know how to connect a 5 wire dual shock sensor to the remote with a relay switch?

Had this alarm in a 1987 Sentra for 3 years, a 1991 NX2000 for 7 years and now a 1996 G20. It is one of my best car investments ever. Hehehe!