Yes, in the fuel gage. By 1969 I know the voltage limiter was a separate rectangular can plugged into the dash circuit board, except Rally dashes (w/ tachometer) that kept it in the fuel gage until ~1973.
Search on ebay for "voltage limiter" and "Plymouth". Some sellers give photos about how to disable the one in the fuel gage. Can also find posts here in a search w/ links to a vendor site (R.C. Electronics?).