You can also go into Cura and File -> Preferences and set the print window type to Pronterface. Then use File -> Print (even if no model is loaded, cntl-p I believe on windows) to open the Pronterface like UI.
On the bottom right is a box to enter commands and above it is the output of the printer. Issue your "M303 C8 S175" command in the bottom right box and wait for the printer to do it's thing. The PID autotune will output the P,I and D values to set in the printer output in the box above the command box.
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illuminarti 18
Try connecting to the printer with Pronterface instead, and use that to execute the command.
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