Apparently there are always some E450s that don't get the memo. Ours is a 2005 E450 Super Duty chassis and does have a tach in the dash cluster. When I perform the remote programming sequence specified in the user manual, nothing happens. Eight cycles of the key within ten seconds and nothing happens. The locks do not cycle to indicate that programming mode has been entered. Nothing. Everything else performs fine in the motorhome. I guess I now have a couple of new remotes that I can use as paper weights.