you can find a boost gauge in a junk yard for a few quit. if not pull an MPG
gauge out of benz and reorient (clock it differently) it will do pressure as well as vaccum. great quality gauges.
also might i suggest an AIT gauge. interesting to see economy changes with warm and cool intake temps.
i had an isuzu once an 86 imark/kadet with NA 1.8 IDI - good engine!
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