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Combo Oil Temp Oil Pressure Gauge Fittings??

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supercub

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Fitting.jpeg
This is the fitting on the back of my oil pressure/oil temp gauge. I'm using AN894 flared tube reducer, trouble is it's leaking. In looking at the both the fittings. Is their suppose to be an O ring used? The AN894 female looks like it's been made to seat down on an O-ring. The base of the threads on the brass fitting on the back of the the instrument also looks like it would take an O-ring is this right or I'm I using the wrong fitting? Thanks
 
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