viper 5900

well be more specific about the car make and year. u asked about 10 questions so ill try to answer as much as possible

1) how many sensors can I put to my alarm? 
you can put as many as u like. just splice the wire and place a diode in between wires white strip towards alarm. 

2) should I use relays or something else instead of just hooking it up directly?
your alarm unit should have built in relays that is a positive. just connect that the parking ligh on the car. test with a digital volt meter, no test lights.

3) my alarm clicks when I lock and unlock it but i don't know if this is normal or not
If it is clicking when u lock and unlock, its just the relays clicking to send the output needed to lock and unlock. like i said before be specific about the car u are putting it into.

4) could it  blow up my alarm in some way?
there is no way to blow up an alarm, however, if you wire it wrong then for sure u will fry ur alarm even a possibility - your car electrical system if dont Incorrectly.

5)how to wire the starter killer (do I need to use extra relays for this? )
from what i know, i dont really install DEI made stuff, never got my hands on one. From reading, the viper starter relays have a starter kill built into the relay pack. all u need to do is cut ur starter wire. maybe im wrong and some1 can correct me.

6)safety module
the alarm iteslf is not designed for manual transmission, however, if u do purchase the safety module you could use the neutral safety module(wired properly) and it will be safer than the E-brake.

there u go man, kelly filled u in on which wire.

cheers

well the car is a 83 datsun 200sx, ka24de engine & 5 speed tranny swap, mechanic fuel inyection, no ecu, mechanic fuel pump etc, crank windows & manual locks, I prefer mechanic things over electric =) they use to be trouble less, and less complicated, at least for me. lol, but I wanted to close & open the car locks just because I'm lazy to take the key out, hehe that's why I want to add the remote start. I'm a lazy guy, lol also where I live it's safer just enter the car and drive than take the time to take out the keys & let somebody get close to you and  then bang bang you, jajaja

well, about the sensors I've wired, I just hooked them as the manual stated, I didn't tried anything else, so I don't know if I'd need diodes between them, but I think I should use them If I'm trying to connect green 2 green and blue to blue wires respectly (that's what I understood) so power and ground wires goes to the same with no diodes in there I guess. if not, correct me please

the parking lights work ok, the alarm relays clicks and everything seems to work fine, I've read the safety module manual but is not very clear, I've just ordered one at ebay and is on the way, so I have to figure it out once I have it on my hands. =) about the relay satellite, I just figured out  that fused red wires goes to constant 12v lol, but thanks for clearing me the other ones ;) really, the manual is not very understandeable, "yes, there are no good drawings" jajaja :D 

also I forgot to mention I want my car horn to sound when alarm is active, it sounds louder and makes people get's crazy :) I've seen there's a horn 2 wire connector but I don't know if must wire it to my steering column or directly to my  horn relay,  that's all by now I think, if someone have something with drawings to connect the relay satellite could be better lol.

thanks so much for your help ;)