This is what is did on mine...
Copied from my post last year.
My coach came from the factory with a Jensen JRV212TB
I phoned the the company
who supplies these units to the RV manufactures and spoke with customer service. I had two options: 1) Install the SCC1 tuner (but this is no longer produced and expensive via Ebay for a used one OR 2) Purchase a SCVDOC1 docking station
and the Sirius Stratus 7
controller. All components were purchased from Crutchfield with FREE shipping. When the SCVDOC1 is plugged into the back the Jensen it will use the Stratus 7 as a slave unit thus I will be able to control the Sat radio thru the original head unit. I will be able to tuck these components under the dash and be clutter free!