Normally I can find the answer for just about anything car related on the internet but I can’t seem to get any positive direction for this vacuum reading anywhere…
you can see it at https://vimeo.com/244265209
Most mechanics I’ve taken it to refuse it.
It’s a newly rebuilt stock v6 in a 1974 FJ40 , running points, everything is new. No leaks anywhere on manifold. It runs great sometimes, but always starts spitting at some point.