Back when Ford was making the jelly-bean shaped pickups, they wired a pressure switch signal to the pressure gauge (instead of a real pressure signal). This had the effect of moving the needle on the oil pressure gauge to one point and never moving. So you had a gauge that acted like a light; it was either on or off. The reason for this (as I understand it) is that customers were complaining about low oil pressure. (Many of the complaints were surely from idiots) So today I noticed that the wide selection of digital gauges available on the Ford Mustang is missing the oil pressure. You can read cylinder head temperature, air/fuel ratio, transmission temperature, intake air temperature, but not the very important oil pressure!
Ford hates oil pressure gauges
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What year is a “Jelly Bean” F150
“The tenth generation Ford F-Series is a line of pickup trucks that was produced by Ford Motor Company from 1995 to 2003; it was sold from the 1997 to the 2004 model years.”
http://en.wikipedia.org/wiki/Ford_F-Series_tenth_generation