The 5th port on your vacuum selector switch (not labeled on your paper towel) goes to the speedometer to control its 2-speed reduction unit which keeps the speedometer reading correctly in both high and low range.

Mike B smile


Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
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Silver Spring, MD