Hey fedge, you guys have 7/11's over there in Iowa? I been there once on a road trip and don't recall seeing one. If you do, the 7/11 has these split compartment Slurpy cups you may be able to use as a bell. Cut it at the split and you'll end up with a half circle cup with a flat side. If you look at it from the top it will look like a " D ". Trim it to whatever height you need, silicone a pair of suction cups to it, and it will probably tuck in nice and neat in the rear of your tank. The cup is a hard translucent plastic so it shouldn't be too distracting, but you may need to use a drill if you need holes in the cup.
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