Anyone installed Myron & Davis in 2007 Quest??

The salesman that sold us the van told us that the units could be added after the purchase. We have not found this to be true thus far. We have purchased the two monitors but can not find anyone locally to install. All say we have to purchase from them and that Nissan Quest after market installs are quite a challenge. We were initially told that the wiring is there just install the monitors. Is this not so??? Any help is greatly appreciated.
Thanks
Angie

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