Fuel Gauge Sending Units compared

rebuild an original. wire is available and the laminate board can be cut with a keyhole saw. The shape of the wire wrapped board is the key as noted. Could even "recurve' the spectra unit using a new board.
Here is another option, a digital flow meter. Put in 16 gallons and just monitor how much you used. ...$25. Maybe?
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Digital Flow Meter Water Flowmeter Temperature Time Record with G1/2 Flow sensor BIO | Wish