I'm installing the optional depth controller. This is the contents of the kit. The top part is the pressure sensor that connects to the circuit board. You have to solder the wires onto the sensor. The circuit board goes between the radio receiver and the dive plane servo.
The depth controller automatically applies full up to the dive planes once you go below the preset depth which is set to 50cm. Above that depth the dive planes are controlled by the remote control.
Be sure that you have a compatible servo. I originally had a Futaba 3003 servo connected to it but found that it rotated the wrong way. I replaced it with a Hitec 303 that rotated in the correct direction.
The flood chamber is modified for the depth controller so that a tube can be attached to the pressure sensor.
The lights and pressure valve are glued into the hatch before the flood chamber is installed. The pressure valve allows you to pressurize the hull to check for leaks.
The light bulb I used was a 6 volt bulbs from Robbe. The black thing is a valve tp pressurize the hull to test for leaks.
The flood chamber is glued to the inside of the hatch. The wires for the rear light run through the glue joint.
The pressure sensor is glued to the bottom of the hatch and the sensor tube is plugged into the red outlet on the sensor.
Here are all of the components in place. The speed controller is held in place with a couple of foam blocks, one in front of the servo tray and one in front of the battery tray. The battery fits great.