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yes, less throttle the higher the vac is.
more throttle lower vac is.
i use a boost gage on my diesel, for the same purpose a vac gage is used on a gasser. it also shows vac on it, so i know when my air filter is getting dirty.
not exactingly the same thing since i have just about 0 boost under 2,200 rpms.
being a VERY near 100% computer free auto, (one small circuit board for the QOS 5V type glow plugs) there's really no other option that i know of.
well OK a EGT gauge would work too, but have a bit of a delay.
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1 86 T\D trooper with rare GEN 3 rods TRANS FIXED  NOW DD
1 86 4WD 5sp pup is 2.3L gas, but plan on 2.2L diesel repower
1 91 trop, long term plan is a group buy of imported Isuzu 4JB1-T 2.8L I-4 engines, hoping to get price down to 2K not 3K plus
1993 sidekick my MPG toy, epa rating 26.
i get 29/31 with stock drive train.
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