LED Dash Bulbs for 67 Barracuda

The rally panel has 4 bulbs for illumination. More or less the same count as others but a larger area to light up. LEDs aren't the only solution. They can fit too loose in the sockets and bottom against the blue tint diffusers and come and go with bumps in the road.
Here's the part most owners don't comprehend... nearly every bulb socket has a screw beside it. That screw and the kept washer on it, and its contact to the circuit board and inst' housing are all members of the ground path. It's a daisy chain of pieces to emulate a ground wire. So even if the dimmer rheostat in the headlight switch is new and full 12 volts is going to every bulb, they can't burn brightly without a proper ground.
Bottom line... when installing new bulbs, different from OEM or not, all 8 or just the 4, renew the ground path.