HOW IT WORKS

Holding two pieces of conducting material in parallel in a liquid will transmit a natural signal through an inductor. From there, the signal is wirelessly transmitted to an antenna sitting directly above it and sent along a coax cable to the electronics board in the helm. There is no voltage coming or going to the fuel tank. There isn't anything physically connecting the two rods to the rest of the boat's electrical system. The probe is picking up the natural magnetic frequency that the material is submerged in and the software is translating that information into a useable form via your fuel gauge.

And it's connected how?
Remove the OEM unit. Measure the depth of the tank. Cut the two 24 inches supplied 304 SS bars so they will sit a 1/2 inch above the bottom of the tank. Run the coax cable through the floor of your boat and bring it up within three feet of your gauges. The Tidewater Blue Series is wired directly into your switched 12 volt ignition system (it’s easier than it sounds), connect the supplied "S", ground and power wires to the back of the fuel gauge using separately purchased electrical connectors (recommend heat shrink terminals and connectors) . Attach the power for the control box to the switched ignition wire that you just removed from the fuel gauge. Make sure you insulate the wires so they don't short out anything later. Connect the cable to the threaded connector of the control box. Turn on the boat power and turn the . Turn on the boat power and turn the key to battery on position. You should hear a beep. This tells you the system is working.  Tidewater Blue Series Probe has reverse polarityprotection which protects the sensor and probe from damage when the power and ground wires are connected to a power source in reverse.

Calibrating the unit:
Know how much fuel is in your tank. DO NOT do this installation if your tank is topped off as fuel will spill out of the tank. It is best if you have 1/2 to 3/4. Have one person hold the probe in hand. Make sure you are only holding the white plastic and not the metal bars. The other person holds the "PF" or probe finder button for four seconds. This enables the control unit to send a signal to the probe which selects the proper program for the length you have cut the sending unit probes to. To set the level, start with setting the empty (marked with E on control unit). Then set the full (marked with a F).

To start, disregard one half inch because the sending unit probes are one half inch off the bottom. For example if you have a 10 inch deep tank and your fuel measures 5 inches, you have a ½ tank. But you also only have 4 inches of usable fuel. You will set the “high” setting of the fuel gauge to just below ½ a tank. Don't over think the reading about being below the pickup. On metal tanks, the metal will naturally throw the reading off the amount needed to compensate for the ½ inch difference.

If you are using a plastic tank, you will have to adjust the level for about 1/8 of a tank. Repeat this about 4-5 times until the needle stays were you want it in and out of the tank. Use RTV on both sides of the gasket and screw it down snug. The Viton® gasket is formulated to work with all existing fuels on the world market today.