I feed my gauge off one of the 3 ports at the back on the intake (the clear line runs to the gauge):
[Linked Image]

5-10" Hg is pretty common up at highway speeds. That says the engine is pulling in a fair amount of air and putting out a fair amount of power. Get down to 0" and that is it, max air flow and max power. I basically use the gauge as a "how much extra power is there", like if you are thinking of pulling out and passing someone but are down near 0" on the gauge, might as well forget it as you won't have any extra "get up and go" left.

r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
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