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  #1  
Old January 8th, 2016, 10:18 PM
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Baird M. Gehring
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Oil Pressure Sender Thread Size 4.0V8

I'm trying to test my oil pressure with a Pittsburgh Oil Pressure Gauge from Harbor Freight. The kit I bought including 12 adapters but none of them fit, two are close but are really too big. One of the fittings is a 1/8"-28 BSPT Male fitting, none of these work. I've tried finding an adapter at a hydraulic/hosemaker shops who assured me they had all of the British sized fittings. Still nothing will screw into the oil pressure sender port on the timing cover. Has anyone had any success finding a fitting to allow a capillary tube to be attached to test the oil pressure? This fitting is not metric, BSPT or NTP.
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  #2  
Old January 8th, 2016, 11:26 PM
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John B.
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Should be M10x1.0 AFAIK.
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Old January 8th, 2016, 11:28 PM
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John B.
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Or might be 1/2" UNF, which means a -5 ORB fitting.
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Old January 8th, 2016, 11:31 PM
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John B.
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Yes, STC4104 is 1/2" UNF, so you want -5 ORB. Your hydraulic shop guys are not too swift if they could not measure the thread size. Common, normal hydraulic fitting.
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Old January 9th, 2016, 12:01 AM
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Baird M. Gehring
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Thanks for the info!
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