94 s10 blazer. alarm w/keyless

I have a 1994 (1st generation)s10 blazer 4 dr 2wd im adding a alarm system to it but im puzzled with how to wire the 451M relay into the door locks for keyless entry remote control. I have a factory relay under my dash that the door lock wires goes to. Can I tap into the wires goin into the relay or do I hardwire the 451M relay in place of the factory relay???? I have power locks but the factory keyless module was not installed so im goin with the GXY-G20 alarm system w keyless entry.... I searched the door lock diagrams on this site but cant figure out my type of locking system one shows a factory relay listed as Positive...then ones shows Reversing but does not show a factory relay  I was told I have reversing but it looks like a positive diagram coleonlava!!!

If they are positive purple to 12volts green to light blue tap in to the car relay blue to black tap in to the car relay brown and white do not use