I am in the process of getting rid of the pressureized tank. I have a 1957 5.5 johnson, cd14.
I can NOT find the 2 prong connection that would mount on the motor to take the place of the 3 prong one.
These are easy enough to find. You can try any of the salvage yards listed in the top secret files. OMC started using it from '58 on so they should be a dime a dozon.