A couple of thoughts that I've seen successfully around me.
#1 - Sales should give the customer the choice and really sell the differences. The factory one is more expensive for a few reasons that might be worth the value to the customer. Show them the different FOBs, etc. and the costs, and they'll sell more OEM and aftermarket.
#2 - Some successful OEM installs I see are done on the lot, not as an upsell ... want the vehicle, then you're getting a remote start.
#3 - Dealerships certainly need to consider aftermarket options, but they can't have their $20/hour tech installing them either way. You just can't make any money at that. Look at the AM cost structure and then make an accessory department that can match it. If you don't have the volume to make that work, then don't try and get with a local installer to swing by the dealership to do the install.
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** Rob, Editor Dealersedge/WD&S **Help is only a message post away!
robc@dealersedge.com