I took a base model Gretsch Streamliner and began playing around with mods for fun/learning. After upgrading the knobs and pick guard, fixing some finish issues, and polishing the frets, I decided it was time to go with some new TV Jones pickups. I put a Classic Plus in the bridge and it sounded great.
When I was ready to do the neck pickup, I decided I would also upgrade the wiring harness... WOW what a difference! Not only does my Classic Plus in the bridge sound better, but my new neck pickup sounds awesome too!
The harness was very well done and fit my guitar beautifully. It wasn't hard at all to install. The pots are super responsive compared to the stock harness. The sound im getting know is so clear compared to the muddy sound of the stock wiring/pickups!
If you are going to put out the money for new pickups for your guitar, spend the extra money and do the harness while you do it. you won't be disappointed!