Originally Posted by skupples
MCP25x2 comes with this...
Gives you the option to send the same signal to both pumps. You are correct, the pumps are powered via molex @ PSU, then you can use this included cable to connect both PWM's & feed it from one 4 or 3 pin header, though iv'e never tried using the 3pin part.
I didn't see where he mentioned dual 35X's, or did I just miss it?????
Assuming a dual 35X setup;
The splitter cable works OK to control the speed of 2 pumps from a single channel to keep them matched/synchronized, but if you connect the secondary back to the Aquaero to monitor the second pump's rpm, it ties up a channel that could often be put to better use.
You could run the second pump's tach output back to a mobo header if you really wanted to keep track of it while not tying up an Aquaero channel.