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you get pulse width variation by default on my circuit ,(so you need to count the 0 volts "on" time of the output) , which is the same as a fuel injector signal but a lot less pulses & that is where my problem lay ,with the sensors I have previously tested .
The speed sensor I assume just counts the change from 12 volts to 0 volts & not pulse width.
Still no hot weather to test vapour issues ,February is traditionally the hotest month here ,mostly high 30's so here hoping.
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