The sender is set to turn the light on if pressure drops below about 4.5 pounds. If the light is on and the sender is good, the actual pressure is below that amount but you just won't know how low it is until you get a gauge plumbed in.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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