67 Barracuda Turn Signal Dielemma

When turn indicator comes on with park lamps, the fault is lack of chassis ground at that front turn signal. fixtures on front of 67 have a bulb socket crimped into a cast metal housing ( no actual ground wire ). Fault has to be corrosion inside bulb socket or socket loose at the crimp to fixture. This fault cannot happen at rear fixtures. Park circuit current doesn't have a complete path back to the turn indicator, due to turn signal switch.
A addon part called meter match will correct your fuel gauge.