clifford 50.7x, ’84 el camino

Hello, new to forum.

I have installed a Clifford 50.7x alarm on my 84 El Camino.  I have ran across a clifford back up siren with the key for $5.00.  I would like to install this, there are 4 wires.  Where do these hook to ?  The colors are:  Red, Black, Yellow, and White.  This siren may not be the best thing out there, but for $5 bucks not sure it will hurt. 

I also want to install a set of Air Horns.  I am assuming I need to install a relay to run all these.  Can anyone help with relay specs and how to connect this siren to the normal one?

Thanks 

Hello, new to forum.

Trying to figure out how to properly adjust both zones for my dual zone sensor.  I have it directly plugged into the brain of my 50.7x.  Can anyone help?  DEI tech support sucks and is funny about do it yourselfers. 

Thanks

Relay for air horns to trigger with alarm

Pin 30 - Twelve volts fused according to the rating of air horns

Pin 85 - Ground when armed wire

Pin 86 -  The positive lead of the siren (assuming clifford's siren output is positive)

Pin 87 - to the positive lead of the siren

I made a mistake in my initial post the last line was suppose to be

Pin 87 - to the positive lead of the air horns and you ground the negative lead!

I'm confused on pin 85 ground when armed.  Can this go directly to ground?  Clifford siren output is postive I'm sure.  so...

pin 30  =   12volts constant fused for air horns rating.

pin 85 =  Ground ?

pin 86 =  Positive lead of original siren

pin 87 =  Positive lead of Air horns

Air horns negative is grounded.

sound right ? 

Need help wiring an old Clifford Backup Siren.  This is the older type with a key. 

Wires are:  red, black, white, and yellow.  Where do they go?  I want to add this with a set of air horns to a 50.7x. 

Any help would be great.

Thanks