Wow!!!
You guys are... Really helpful thanks!
I'll give myself and anyone else with the knowledge and tools some advice.
I am by no means an expert! But I do have the tools and supplies: probably 6 different styles of crimpers right up to 000 gauge, 4 different kinds of soldering irons, delphi, weatherpack pins and insulators and connectors, marine grade shrink wrap, different open and closed (un insulated) connectors, wire of most common automotive gauge and different specifications (no cca I won't use it)
There are a couple of generaly accepted methods to tap a wire... And different methods to be used in different situations and personal beliefs. I'm not an expert and I'm not going to say or give advice on what method to use in this situation I haven't even looked at the wiring I need to tap into... but a google search will give you some industry accepted methods for you to choose from. The key to a good tap is that it will be protected from corrosion, will not damage/weaken the wire, and if the location or the way the tap was done has the possibility of breaking because of movement or vibration the supporting the connection is necessary... A wire hold down would be best imho. Splices are a common attribute of all automotive wiring harnesses and if done correctly will have no effect on the resale of your truck ( somebody expressed the ability to return to stock) won't expose your wiring to the elements like another stated. So... choose a method and do it! It will be just fine if done correctly.
The concerns most people have with wire taps are with the easy to insta plastic pinch tap connector and the insulated crimp connectors and terminals. These connectors generally have no corrosion control and damages the wire being taped or connected... Life expectancy of this kind of connection is usually weeks to months in severe conditions lol... Years ago I used them on my trailer and got almost 3 years! Haha... But I personally don't use them anymore.
There's always the twisted wire and electrical tape method... I used this to install my first stereo... I strongly urge you to not do this! Haha.
I should have known better than to ask for help here. Everyone is going to have an opinion on how to do this properly. And more importantly people are quick to judge and troll..
A harness is absolutely a fine way to go... For me it's an expensive way to add a bunch of wires that I don't need. For me a wire tap, primary wire, a two pin weatherpack connector. Wire loom and approximately sized grommets for wire penetrations what I'm going to do.
Whatever you do be nice doing it!
Merry Christmas everyone!