04 toyota highlander second starter wire

Looking at the schematics, I see it (04 highlander) has a 2nd starter wire, I'm planning on installing an autopage rs-900. Do I need to connect the 2nd starter wire? I read somewhere srs light will turn on? If I dont connect it........ If I need to connect it,.....The rs-900 has a 2nd starter wire option but its a (-), do I use a relay to convert to + ?

Can I connect both vehicle starter wire to the primary starter wire on the autopage module?  (ie. 2 wires to one) Any harm?

I've done 2 remote starters in the past but never with a 2nd starter

Thanks in advance

Is there a difference between chris's method and this one?

85 (-) 2nd start output from rs900

I'm not familar with relays and have only used them once or twice