Although there are advantages to having several data retrieval inputs when hypermiling, a simple vacuum gauge will give you most of the information you need to achieve great mileage.
Low RPM acceleration at 2 inches of vacuum is great for your pulse, then you want the highest vacuum when cruising. You can even tell when you are in a drafting situation with a decent vacuum gauge.
Rewiring a car so it would be OBD2 capable would be a monumental task.
regards
Mech
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