You already have the MW power supply rated at 24 VDC, 8.8 amps. That's roughly 211 watts. The photo you posted of the pump specs shows a max of 170 watts. Have you tried hooking the power supply directly to the pump? Should work if you wish to run it at full speed. Just need to confirm polarity of the leads. The 3rd wire is no doubt feedback to the controller & not needed if running at full bore without control circuitry.
If you're handy with a soldering iron & really liked the way the 1st gen controller worked, try replacing the electrolytic capacitors on the board, the firecracker cans. Quite often these fail & render the rest of the electronics useless. Sometimes you can see the failure in the form of bulging at the top of the can. Many an expensive electronic component has been trashed due to failure of a few cheap capacitors in the power supply. They're only a few $$s each & worth a try to see if it will resurrect the original controller.
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