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Re: 1967-72 Factory Vacuum Gauge RPO Code????
I agree too. The vacuum gauge was for 40-50-60 series trucks with vacuum booster brakes. I think if one of these larger trucks was equipped with air brakes, the air pressure gauge goes in that hole.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.
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