It will only be using the wideband to trim the fueling, Ryan will have mapped it with out the sensor. Dont worry about that.
As Dude says you can buy a sensor which will wire directly into the syvecs as the AEM one wont work on the Syvecs.
I would replace you AEM one for now and then if your worried about the reliability of it get a specific one for the Syvecs at a later date and run the two. The other option would be to ditch the AEM one completely, if you have a sensor wired direct into the Syvecs you will be able to see it on the dash 2 anyway so you wont need the gauge.