During the install, the plug for the LED goes into the light bulb receptacle. It can go in upside down--ergo, watch the polarity. So far the blink is the same as before, but I only tested it once.
With the color of your truck I would tape off the clear and tint the red a bit with spray tint darken it a bit. Make it darker to more closely match your truck, well thats my style at least.
Thanks for the suggestion WhiteLimited, but I personally don't like dark taillights. And, they are harder to see in the bright sun we normally have around here.
Bill W
38N121W