location for 1968 4 speed reverse light on dash

That's because 68 and older cars with 4 speed had this janky shifter made by Inland Corp. with reverse lockout pull up T shaped lever on the handle. Guess Chrysler was trying to be fancy like GM with the lockout T handle thing. People were swapping em for better Hurst units so Chrysler took note and decide to offer the Hurst as standard equipment in 1969. It doesnt have a reverse lockout, so I am betting the lawyers got involved and said put a bright assed caution colored indicator before somebody puts it into reverse at a traffic light and let's the clutch out.

Well that makes sense, I forgot about the Inland shifters year range. So a '68 with an inland shifter probably wouldn't have had a reverse light indicator because it had the lock out mechanism.