You are referring to the Ralleye Gauges and there were several versions of them over the years in the B-Body line up. In 1968 they have vertical ridges and are Dodge only. These were were standard on the Chargers and therefore sometimes nicknames the “Charger Dash”. Coronet R/T had optional Ralleye Gauges.
Mid-year Super Bee introduction also has them as being a standard item. Remember, the Super Bee is based off the Coronet, So Coronet R/T - Optional....Super Bee - Standard.
1969 Ralleye Gauges have pebble grain sometimes called the “Camera Case finish. This was wood grain on Charger SE & R/T SE. Once again, the Coronet R/T had the gauges optional while the Bee had them standard.
1970 Ralleye Gauges have pebble grain and are standard issue in Road Runner and the Charger and Charger 500. The Woodgrain Ralleye Gauges are standard in GTX, Charger SE, Charger R/T & R/T SE, and Super Bee, but once again, optional in Coronet R/T.
Make sense???
Cheers
Dave