First off, welcome to iRV2!
Re: VSS signal tap. It would help to know why the stereo wants a VSS signal, because Ford says you should not tap into it (link here
Vehicle Speed Sensor:
The source varies by model.
Sources include the Anti-Lock Brake
System (ABS) module, a transmission speed
sensor or the Transfer Case Speed Sensor
(TCSS) for 4x4 model equipped with a manual
transfer case. The vehicle speed signal is
either a speed variable frequency AC signal, or
a SCP Data message depending on the
source. The vehicle speed signal must be
operational for key sub-systems and the
vehicle diagnostics to operate properly. Do
not tap into or splice any VSS signal wire,
sensors or engine and transmission damage
may occur. For 6.0L diesel engines use VSO
wire, circuit 239 (WH/OG) for the vehicle
speed signal. For all other engines, installation
of an additional sensor will be required.
Finally, you should add a "signature" to your profile. It contains whatever info you want; most people put info about their coach there, so they don't have to type it into each message. Instructions for adding a signature are here