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I was thinking about working out something with an Arduino, but came across a used Dakota Digital 6 cylinder to 8 cylinder converter for pretty cheap, so that's going in. The tach basically counts cylinder fires and since the cluster comes from a 3 cylinder car, it assumes 3 fires per rotation. A 4 cylinder engine thus reads one too many.
You're right about economy. It's on my short list to get a gauge in here to temper my use of the go pedal, so much easier to be frugal when you can see the results immediately
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