"An old tire pressure gauge will work. A bit messy, but with a rag wrapped around the plug end, should work."
The 240 didn't get a Schrader valve on the fuel rail until '92, and yes, since it pointed downward with no clearance, a stick-type tire gauge could make a mess with the engine off and a fire threat with it turning, and that rag gets soaked pretty fast unless the rail is nearly empty.

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Art Benstein near Baltimore
What's the fastest liquid on earth? Milk, because it's pasteurized before you see it.
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