Replacing Instrument Cluster bulbs with LEDs - Illumination Detail Question - 67 Barracuda

NO LUCK HERE with LED taillights!

I replaced the 2 flashers with electronic ones.
Everything still worked well.

Tried the LED taillight - no go!
Tried using the load resistors; tried several times since the wire clips suck as connectors....to be sure I had good wire contact - still NO LUCK!

What I did notice when the one side worked while the headlights were on is....it really wasn't all that much brighter to make a big difference in the 67.
So, I'll just be content with the incandescent bulbs.