Steps to remove the old control board and move to duet.  The New electronics were not going to fit under the machine so I just put it all on top of the bottom electronics bay

First I'll start with a mistake, the power supply on the ender looked kinda weak so I had a more robust one laying around, after setting up the wires and starting some tests the bed wouldn't heat to full cal temp 
I ran M303 H0 S60 for the bed  to calibrate 

I realized the power supply i chose was 12 volt, the ender being 24. so back to the ender supply. Also I used an external MOSFET to take the power for bed heat off the duet. the duet will run on either 12 or 24 volt

The ender had a great bed level system from uptanium but they no longer are on line or responding. 

I installed bl touch, primarily because i have it installed in all my other systems and i have learned the hookup

The online config program has the bl touch as an option so its pretty easy  https://configtool.reprapfirmware.org/