Rule of thumb - fuseable link wire should be 4 wire sizes smaller than main feed.
I ran #8 wire from the alternator to the starter relay with last 6 inches of #12 fiseable link wire.
Rule of thumb - 4 wire sizes smaller than main wire. I ran #8 from the alternator to the starter relay with 6 inches of #12 fuseable link wire. Not sure what size fuse but I blew a 30 amp before I went with the fuseable link.
I put mine in the glove box and use the remote control the stereo came with. Original am radio still in the dash. Truck speakers under the front seats.