Product review (1 stars): disappointed
When I opened the box, I turned the shaft CCW until it switched off. An ohmmeter showed that the contacts were open.  I rotated the switch fully CW, but the contacts didn't close until I tapped the unit with the handle of a screwdriver. That was a bad sign.  I hoped maybe the switch was a little sticky because it was the first time.

The compressor ran several hours, but when the control switched it off, it never switched back on.  This time, tapping didn't help. I put the old control back in.

If quality control had caught the problem, it would have saved time and trouble. The post office delivered my return February 25. Amazon posted the refund March 14.