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bingo - that was my idea in the first post Another $1m idea that someone else has.
After doing some digging, I don't think I have any other options. I would drill into the tank but the only place I can mount the sender is on the side so it won't hit bottom.
Side mounted sensors won't work because I can't get to a side (fully) to install.
I'm going to look again tonight but if this will keep track of my GPH usage that'll work for me. I know how big the tank is and will just start from full and track it that way.
Bob, just a thought here; if the sender through the top of the tank doesn't go all the way to the bottom, no big deal IMO. The important thing is knowing when the fluid is getting close to the top right? When you get a 3/4 full reading, it's time to start thinking about a pump-out soon.
She was a 1969 36 ft wooden beauty with big blue 440s that we'll miss forever.
And thanks to the gang, 2012 Trojan Boater Of The Year
BigD - this is my freshwater tank so no pumpout... I need to know when it's running out.
G36 - I meant your options are probably my ONLY options and not bad ones at that.
I like the Digiflow and I think I'll order it today. It looks like it works in 100 gallon increments, my tank is 55. Does that mean I can set it for 100 and then when hits 40 I know there's only 15 gallons left?
I can live with doing some math if I understand how it works. You're right, it does more than I need but for $30 it's a good deal and no wiring.
sorry bob
yes exactly
thats what i do. i set it for 100 gallons and then (my tank is only 40) when it shows 60 i am empty. and then reset it when i fill up. no big math here. it would be nice if it counted up but no big deal. and for the price its great. i couldnt see spending the other money for another that did count up.
the unit is self contained but i did adapt it (very easy) to my preference. i did install the display in my galley. meaning i did run a wire to the sensor that i put by my tank. you dont have to do that if it is a convient place to mount the unit in your water line and you can see the display. if you want me to tell you more about the wiring so it will make sense to you let me know. basically all you are doing is lengthing the wires from the sensor to the display. there were 4 i believe
1997 CARVER 405
"the BLACK PEARL"
past fleet
1978 F32 SEDAN CHRYSLER 318's
current fleet
1997 seadoo gts
1997 yamaha wave venture
1985 sunbird 18 ft runabout
1968 coronado sailboat 25 ft
sunfish
14' hobie cat
canoe
8ft portabote
Installed 2 Snake River external sensor tapes on water and waste tanks. The bottom strip does not go on the bottom of the tank, but at the 1/3 level, so you may have enough room to access that area of the tank. Both work perfectly. Basically you put the sensors on the top middle and bottom third of the tank and the gauge reads out "full", "2/3" and "1/3". When I get to "1/3" on water I fill up, when I get to "2/3" on holding tank I pump out. Brainless. Installation was very easy, took a few hours, just plan out the routing of the wires and the location of the gauge. Low voltage use, too.
Randy, you're right, I've done several installs of those and they truely are no brainers. If you can reach 3 spots on the side of your tank, (one above the other), stick the sensors on, wire them up and you're done. No holes, no stink, no leaks, NO clogged senders.
She was a 1969 36 ft wooden beauty with big blue 440s that we'll miss forever.
And thanks to the gang, 2012 Trojan Boater Of The Year
Another $1m idea that someone else has. 
