Dash LED Upgrade Doesn't Work - Because?

Now that I have power to the dash lights, I took everything I thought I've learned, and installed the LED bulbs in the dash today. It's a mixed bag; the instrument lights work, but don't dim. The turn signal and high beam lights won't work with LED no matter the polarity. The oil light is bright enough with the old incandescent bulb. All the LED bulbs were checked before install. What a ya think of that?