A straight LED usually takes a current limiting resistor is series with one lead. If you are trying to replace the 194 bulbs with LEDs, they make a drop in replacement automobile LED that replaces those bulbs.
My dash that I linked you to in an earlier thread has LEDs for blinker and hi-beam indicators. I got some with black bezels that press into the dash. Hook to a ground and connect the + lead from the LED to the correct wire in the 12-pin connector.
I want to add a red one so I have a voltage indicator.
Note that Covan's uses American Autowire for their "bundled" dash harness wiring. Further the dash harness thus provided uses very small LEDs for turn/stop/high beam indicators. By all appearances they were straight wired into the circuits with no resistors whatsoever.
Note that the blue high beam will be too bright this way and you will want to do something to detune it a bit.
If these things were not so small they just might look hokey.
A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!