Hi,
the orange cable from HW should be used anyhow - middle pin of EXT/RPM/E2... will give you very accurate rpm readings via telemetry. just do NEVER use E2 port or you'll crash for sure.
to use HW gov you just have to do 'nothing' in Spirit RS governor setup... set throttle channel matching your TX setup (i.e. #1) as usual, and in gov setup page just set the correct poles / gear ratio, frequency to 60Hz and that's it more or less. do not activate the Spirit governor (just to set the poles / gear ratio, but uncheck it again afterwards).
then you have to calibrate your HW Esc if not already done... activate Gov/Gov store in HW setup and you're done. (flat) throttle curves are set in TX as usual... that's all folks