The Cateye is very simple to install. Just follow the following guidlines
1. Attach the controller box to the rear firewall area using included nylon ties
2. Route the sensor cable down to the underside of the vehicle behind the engine. take care not to pin the the heat protected cable agaist any hot surface3. Use the nylon tie to attach the sensor securely to a location where it points toward the converter. There are many options. It is best to mount the sensor in a location that is even with, or above the converter. See photos below for examples to suitable locations.
3. Attach the leads from the controller box to the car battery. Red wire to the (+) battery post, Black to the (-) battery post.
4. Once Installed, press the "A" button on the fob to activate the system. The siren will sound for approximately 5 seconds and then turn off. It may take a minute for the system to stabilize. During this brief period, the sensor and siren may act a little erratic
(not respond, respond too much)
The controller box can be installed somewhere on the fire wall. The battery leads are about 3.5 feet long, that should be enough to reach to the battery.
The reason that the firewall is a preferable location is that the sound will be focused down underneath the car, making for maximum volume level.
Route the sensor cable from the control box down behind the engine to the bottom of the car. The sensor can be mounted anywhere within the reach of the cable. It is important to mount the sensor higher than the catalytic converter. It is very sensitive and has an extremely wide area of vision. If its mounted too low, it may activate when someone merely approaches the car. You may want to experiment a bit with the exact location before you fix it in place.
Note that is small and dark - so its not going to be easily found and disabled by an intruder.