remote start wiring

I've got myself a cheap no-name 2 way paging alarm with a remote start feature (i realise everyone is shaking their heads right now) and i've got a couple of install questions. I've attached the wiring diagram incase someone recognises the loom. The (optional) remote start socket has the green wire showing a connection to a park brake light, which i'm guessing means the alarm won't energise the start relays unless it sees a +ve 12 volts from the hand brake light. If I was going to be installing this on a kawasaki ninja 1996 motorcycle I think i should be fine to run this to the neutral light to achieve the same purpose?!?! The diagram also shows a purple wire leading to what looks like the ignition coil in the diagram. Is this an induction sensing wire to check to make sure the starter has actually successfully started the car and if so it'll have to be sensing current to work the remote start successfully won't it? Finally, the digram doesn't actually show the piezo siren anywhere, kind of important for a decent alarm i'd have thought. I think it'll be the purple lead which has a tiny little diagram of what i guess is a siren, with -ve of the siren earthed? Any ideas if that is the one? Cheers Scott