You will get different readings depending upon where you install the sensor. The machining plug in the front of the oil pan is where the oil leaves the pan and goes to the oil pump. The temperature at that point is lower than it would be if you measured the temp where it enters the pan as it returns from the engine. My point is, don't fixate too much on an absolute number. It's more important to determine while riding what the usual temp range is for your bike under your riding conditions at your chosen point in the system. Once you know the "normal" range, you would only react to the gauge readings if they exceed what you normally expect to see. The "normal" range on a Harley is pretty wide compared to a modern car or truck that has a more sophisticated and controlled engine cooling system. You will have to compensate for ambient temperature as Don noted. Harley's "spec" is 230° F in standard ambient conditions, which is roughly 70° F. As the ambient temperature increases you would expect that 230° to also rise.
A long winded post to basically say, your results will vary.
Jerry