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Message: <blockquote data-quote="Mr_Canoehead" data-source="post: 1465449" data-attributes="member: 86927">I had an twinmax electronic unit for a while - I was getting wildly different readings depending on which way it was connected. As an engineer, it drove me crazy so I did some research and learned that it was measuring differential between the two sources but the sensor was only accurate one way (ie Port A had to be higher vacuum than Port B to get an accurate reading). I don't know if the newer electronic units have resolved that issue, but  given your background, I'd check it out before spending a bunch of money on one.I'm pretty happy with the results from my Carbtune.</blockquote>