[77newell]

Since this problem started after the mechanical changes it is clear that something is hooked up incorrectly. The governor's pressure sensing line should be connected downstream of the dryer and the line from the governor to the compressor unloader also goes to the dryer control port. If it is hooked up any other way things will go funky. Get a diagram of the port connections for the governor and compare that to how yours is plumbed. You will find the problem.