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Just got a 1978 Montauk 17 with the fuel tank under the RPS (as is standard). There is currently this (http://www.moellermarine.com/moeller-marine/fuel-containment/12-gallon-high-profile-portable-fuel-tank-630012lp/) tank under the seat. It is very difficult to tell how much fuel is in the tank. Tapping seems to be the best option as the analog fuel gauge is under the seat and I cannot slide it out entirely. Has anyone found a good way to tell the fuel level in a small opaque tank like this? Is there a digital fuel sender that might fit in the existing analog hole?

12 gallons isn't a ton of fuel and although I am carrying a 5 gallon tank with me generally, I am sure if I ran out it would be in the middle of Cape Cod Bay with the entire family on board. Thanks!

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Short answer is ...no.

All fuel gauges and senders for an above deck (and below deck come to think of it) fuel tanks are far from accurate, especially when you are on the moving water, not level etc.

If you want more capacity with a bit better ergonomics consider this model.

At the moment West Marine, of all places, has the best price.
https://www.westmarine.com/buy/moelle...--11052461

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Bummer, I was afraid of that. Guess I will just replace the tank with something a bit better (like the one linked above) when needed. Seems like I will need to refine my tapping technique. Thanks, Phil.

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The real way to more easily access fuel tanks on a Montauk is to raise the Reversible Pilot Seat a little. Then you can see the fuel gauges, and buy another one of those Moeller tanks giving you 24 gallon capacity, which the boat really needs.

Maybe you can get my personal website crazy photobucket link to work - Montauk album. Try the slideshow button upper right.

(edit to add photo)

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I like that move. I have felt like the seat is a bit low anyway. Might have to give that a try. Thanks, Finnegan.

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I used a stick with markings on it. Open up cap and insert stick.

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You never said what you have for an engine but you are going to have the same problem with a single larger tank as you do with the tank you have now, you don't know exactly how much is in there. You really want a dual tank set up like Finnegan has. Go here and have them make you a couple with the fuel gauge on the end so you can read it, (D-1212)

https://miraxfuelproducts.com/rectang...lar-tanks/

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I have a 2005 Yamaha 70 hp two stroke on it.

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Can you put a stick in it? Open cap, insert stick with 1/4, 1/2, 3/4 on it.

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Yes, this is probably the best idea at this point. Just grab a dowel and mark it.

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BAMM!