If you do end up using a tap, search for posi-tap connectors, they are way better than the blade style ones that pinch onto the wire. When I wired my trailer hitch, the blade connectors that came with my harness were junk and worked intermittently, so I replaced them all (except passenger side turn signal) with the posi-tap connectors. Guess which one doesn't work reliably these days
Disclaimer: Maybe the blade taps that came with my harness were junk and other brands are better, but I really like the posi-tap connectors.