The International Cessna^® 170 Association

and if the copper crush gasket leaks, it was probably tightened too much. for torque, last time I checked, TCM says something like ..... "oil tight". Lycoming has better recommendations...

Thanks Guys. Turns out it wasn't a mismatch between the adapter nut and the capillary bulb flange. Both had the flat faces but are not sealing properly as oil continues to come out of the back of the NPT fitting where the capillary line goes into the fitting. Gauge now out to be sent to instrument shop for eval. Probably will get a new capillary tube installed with all new fittings. Or a replacement gauge. The saga continues.