Adding Tilt/shock/timer sensors to factory alarm

akurei wrote: Shovk sensors only have a power wire, ground, and trigger wire. Shock sensors send a negative pulse to the factory alarms trigger

Some do, and some aren't that simple. I know the DEI sensors with a blue and green output are "multiplexed", and are plugged into dedicated "multiplex inputs" on DEI alarm boxes. I have seen DEI shock sensors with only a blue wire, and they are indeed contact-closure, and can trigger a contact-closure input such as a trunk-pin. Your sensors have green wires, and may behave differently than you think they do. Test them.

akurei wrote: Is it safe to hook up the shock sensor straight into the pwr, gnd and trigger wires without a relay and fuse?

For the power, the concern would be the fuse size for the circuit the sensor is connected to. Remember you fuse for the wire size, not the load. So if you connect that little red sensor wire to a 50Amp main feed circuit, the little wire will fry without blowing the fuse. If you connect it to a Hot circuit protected by a 5 or 10 amp fuse, then it will be OK. For the trigger, I have no idea. I'm not familiar with the particular sensors you have, the 370 itself, nor Asian cars in general. Personally, I'm not knowledgeable enough to make an informed assessment. Test.