Eloi the regulator will go in the housing with the camera. Take your 18v from your power terminal into the board and adjust for 12Vdc. The unit is very small even with the LCD.
Christian if you have the regular tether you send the video up two wires (1 twisted pair). At the topside install and RCA connector into your topside box. Use a standard RCA cable to go into a monitor. The picture is very good. If you like but there is no need, you can use a video ballun.
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