On mine i pulled the allen plug from the head, drilled out the center where the allen wrench fits, then threaded it with a 1/8 pipe tap. screwed the sending unit in, then put it back in the head. I used sealer on the plugs threads, as I used the sending unit to tighten it. On the oil sending unit, just used a brass t fitting as I wanted to retain the idiot light also. I have done a couple bikes like this, no problems. Here is the last one. And these are not motosens gauges, bought the gauges from Amazon, 1 1/2 in had to machine the pods for them.
