Adding Shock Sensor to Honda Pilot

What are you looking for the shock sensor to do? If your factory alarm doesn't have provisions for a warn away type of alarm, the sensor would have to be used to just trigger a full alarm cycle. If that's what you want, you could use the sensor to drive a circuit that can stretch out the pulse output if necessary, and control a relay, which can then be connected to one of the factory trigger inputs, like a hood switch or door sensor. The shock sensor probably won't interface directly with the factory alarm, since it may not have enough drive capability or sufficient duration to trigger the factory alarm inputs. You just need to find out the details of available triggers for the factory alarm to see what you might need to buffer the sensor output.