I got ten Weatherhead Eaton 6100X2 fittings today and they fit the back of the oil pressure gauge perfectly. Looking at the bevels on the male and female ends screwing in the fitting could operate as a compression fitting on the 1/8" tubing (or if not perhaps a flare may be required).
As to Rob's thought that the gauges for 216 and 270 engines may have different numbers and different pressures he may be right. The gauge I have marked for 30 pounds has the numbers 1506373 and 1506375 on it and the one in the Fox parts book is 1506377, presumably matching the 80 pound upper range painted on the instrument cluster glass. Looking at the 30 pound gauge guts I don't think there would be any damage if it was subjected to higher pressure. You just wouldn't know what the pressure was if it read over 30.
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