Tom, is it possible that using a modern GM ethanol content sensor and deciphering how the voltage from the output wire gets interpreted would be easier than designing a ground up sensor where one already exists? A lot of the aftermarket ECU's interface with this common sensor. I think it outputs in frequency (hz). The numbers you posted of 50-150 sound familiar and may be exactly what these sensors use.
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'65 Tempest 467 3650# 11.30@120.31
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