Am I doing something wrong here? I swapped two bulbs to LED upgrades to add a bit of brightness to my Barracuda's rally gauge cluster and now neither work. Contacts look clean. I even tried swapping back to original bulb and that doesn't work.

I could see some sort of failure occurring on one, but not two. Its got to be something I've done incorrectly.

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1968 Plymouth Barracuda [Daily Driver]
1972 Dodge Dart Swinger [Lent out as Daily Driver to a friend]
2010 Challenger R/T 6 Speed

I read elsewhere that some LEDs are polarity sensitive, so i tried swapping them around. Still no go.

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1968 Plymouth Barracuda [Daily Driver]
1972 Dodge Dart Swinger [Lent out as Daily Driver to a friend]
2010 Challenger R/T 6 Speed

LED's are polarity sensitive and also typically require full voltage to operate, so they may not be compatable with the dimmer circuit for the dash lights,

check the voltage that is available at the dash bulb socket.