I did on my friend's ranger(same HU). I just got some 8ga.(10ga. is fine) power cable, fuse holder, and 2 ring terminals. Just connect the power cable to the positive post on the battery like you would when installing an amp, run the fuse about 6-8" from the post, and run the cable through the firewall. There's a grommet about 8" or so from the driver's side fender on the firewall you can run it through. Then all you need to do is route the cable from the grommet in the firewall behind the dash. Then just solder or crimp the cable onto the HU's wiring harness(yellow wire). You also need to upgrade the ground wire, don't just use the factory ground. Just use about 6" of the cable, and ground it behind the dash. There's a bracket that holds the factory amp right underneath the HU, behind the cig. lighter. There's a couple screws holding it in, one on either side. If you take peel back the carpet on either side, you can unscrew one of them and connect the ground there, using the second ring terminal.