Rarest A-Body Option?

Calm down Guys and Gals!
Rallye Clusters started on A bodies with the 1967 Barracuda and were last used on 1970 A bodies only. The speedo heads had 2 different cable connectors; Threaded for 1967 and the more common white plastic retainer clip 1968 to the end in 1970. Until this 110 all I have ever seen were 120 and 150 MPH heads with or without Trip Odometers. In the center hole you had the choice of a blank, a 24 Hour Clock, a Performance Indicator , or a Tach.
As for the Key Light Delay option, Lets just say that I have had this option on 90% of the Darts I have owned so far.It is part of the A01 Option package.

Hope this helps,
Bruce B.

PS: MOBodyman..... That is a good question!