I also bought an amplifier from a salvage yard. Holds the speed fine, and works Ok, but I must set it 10 mph before the speed I want.
Example:
If I want to set it at 80 MPH, I must do 70 MPH and push the lever up (momentarily) and release it. It will continue to accelerate to 80 MPH and then hold that speed.
It does that for all the speeds above 45 MPH.
If I set it below 45 MPH, the increase is only 5 MPH.
I am soooo glad it works for my loooong trips
