LED Instrument Cluster

Yote said
Remember that LEDs are polarity specific. You may have to turn the bayonet style bulb 180 degrees for them to work.
Also you will probably need to replace both flasher units with the electronic version as leds do not draw enough power for the originals to work.
For whatever reason I had to leave one of the old style bulbs (I don’t remember which one) in the circuit for proper operation.
I got some LED tail light bulbs from ‘Walley’, they both lasted approximately 1/10 of a second. Replaced them from ‘Super Bright LEDS and they worked great.
Yote

The superbrightleds LED's worked great for me too. Like you said, be sure to use a flasher with the black ground "pigtail". The "LED flashers" I got initially did not have the pigtail and they did not work. Moving to the correct flasher fixed things. I converted my 70 Duster to all LED (except headlights) and had to leave the OE style brake light bulbs in place for things to work properly. Other than that was a great upgrade.