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I leave it to each of you individually to determine the best system. I considered features and cost. TheLegacy system I purchased has a tank profiling capability and does not use any float sensors.The programming and tank naming capability was descriptive and it enabled the monitoring of eight tanks including fuel and propane with the right sensors. It also was compatible with other companies sensors if you were retrofitting from an older system.

I chose to monitor my water tanks and my holding tanks.

I built a small teak mount for the common control panel and placed it in the starboard quarter berth just to the right of the door as you enter. That provided relatively easy access to the engine room for wiring.
Power goes to the control panel (I provided separately fused power from my electric winch supply in the engine room).
Each sensor requires 18 guage 3 conductor wire. (power sensor and ground). I brought all the grounds back to the panel and commoned them with butt connectors before going to the panel. (By the way, the documentation for this system is excellent)

I tried to use tape sensors wherever possible. I specced the following sensors for the tanks, rear holding tank-tape sensor, aft water tank-rod sensor 11", sub sole tanks-tape sensors( on my boat the sub sole tanks have a hole in the middle like a donut and I installed the sensors there), forward water tank-tape sensor, forward holding tank-rod sensor 13"(I needed to cut a small hole in the holding tank cover to accomodate the top of the sensor but it does not even stick up above the cover level).

It is worth noting that I started the installation process by trial mounting the panel and providing access to the engine room(I already had a teak wire way for my electric windlass and gen set controls, which I utilized). The next step was to get all the wiring, except the rear holding tank through the engine room and the port quarter birth. I wired up the sensor for the aft water tank and now could put the quarter berth back together(this is important as there is no room to have the whole boat apart at one time!!). Next step was ripping apart the salon. This does not take all that long. I ran wires to the subsole tanks, hooked up the sensors and ran wires through the salon to the pullman berth and put it back together. Last but not least I ran the wires to the forward water and holding tanks and hooked them up. After all the wires were run I connected them to the panel. Be really careful with your wire connections, if you make an error or lack connectivity it will be a lot of work to rip everything apart again!!!

Now you program the system. I found the directions very clear, although to be honest my first mate did most of the programming.

This took me about 12 to 14 hours, with a helper. Not an insignificant project but you can imagine how helpful it is to know the status of all your tanks. So far the system is working well. I haven't provided pictures of my system. I could do, but check out the web site first, their instruction guides are excellent and hasve pictures of the panels and sensor installation process.