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Vacuum gauge should connect to the intake manifold-- or a vacuum reservoir.
That one looks added on but I think some trucks had them as OEM.
A vacuum gauge is sometimes used to help promote economical operation. As a safety item to make sure you have vacuum for the brakes i guess i could see that as well.
Although a vacuum gauge is not a normal item I’ve see then on Ford trucks before, that is a Ford gauge as that needle style was on the instruments in the LTL models I’ve owned and driven, pretty sure the air pressure gauge in my F-800 is that style and in the same location
That's stock, it was on all medium duty F-series trucks with vacuum booster brakes. The hose should go the the vacuum tank, not the booster or intake manifold. Sometimes I believe it was tee'd off the check valve on the dash. It was a safety item to let the driver know it he was losing vacuum, because with no vacuum there was no brake boost. It should dip momentarily when stepping on the bakes with the engine running.
That's stock, it was on all medium duty F-series trucks with vacuum booster brakes. The hose should go the the vacuum tank, not the booster or intake manifold. Sometimes I believe it was tee'd off the check valve on the dash. It was a safety item to let the driver know it he was losing vacuum, because with no vacuum there was no brake boost. It should dip momentarily when stepping on the bakes with the engine running.
Assuming that was a 80’s thing, I’ve seen vacuum gauges on a few 60’s/70’s models but most of the F-600/700’s I’ve been around didn’t have them
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