Hello Ortie!
You have to replace currently used S-Bus Adapter by FrSky integration cable (with small modification described in the guide).
Additionally to power up the receiver you can connect secondary BEC to some free port or additional servo cable (to a free port in the unit).
So it will look like as in the guide:
http://manual.spirit-system.com/index.p ... _TelemetryIt will transmit channels and telemetry over the FrSky integration cable.
RPM wire will be connected in the same position as now - it is only possible that same connector will be used (shared with modified FrSky integration cable).
You can get also 1-pin plastic for both RPM lead and integration cable. We can give you some for free.