Well - I pretty much did my dual pickup Mustang bass.
Routed two slots for the extra pickups and wired it up with stacked knobs.
I just temporarily cobbled together a piece of aluminum plate to hold the lowest pickup.
I'm still trying to figure out the best method for mounting the lowest pickup.
Putting up a couple 'progress' pics. I still have to make a mount for the lowest pickup,
and I'm going to paint it next spring. That's a ways off, so here's how it is now:
Not sure it was worth the effort as far as sound goes. It doesn't really sound a whole lot different.
The biggest difference is in the highest pickup (towards the neck), and the lowest towards the bridge.
I have it wired for the top two pickups to sound together, and the bottom two pickups to sound together.
The timbre of the top (D&G) strings matches the lower strings (E&A) better this way,
no matter which pair of pickups is sounding, IMO.
Of course, the neck pickups are darker than the bridge.
No so much difference as having a P/J setup,
but the overall sound is different no matter which pickups are sounding.
I like it, but wouldn't do it again.
There's no going back now with that big route below the pick guard.
If I would have just done the top one, it could be covered up with a new pick guard.
Routing all the wires was a PITA too.
I had to cut some channels for them to run through.
When you take the pick guard off, there's just two small routs for the stock Mustang pickups, and the rest looks like a solid body.
There's also a small hidden channel that the wires run through to the control plate.
It looks a bit of a mess now with the pick guard off because I made four extra (visible) channels for wires.
I also had to extend a couple of the wires from the top and bottom pickups because they were too short to reach the controls.
This was just one of those crazy ideas that I've been thinking about for a long time, and I finally got around to trying it.
It's the first project I've tried like this, and I've gained a new found respect for the people who really do it up right.
Lots of mistakes and lessons learned, but I have a bass that I think is pretty unique now.
Forgot to add - the bass is a Squier Vintage Modified Mustang,
and the pickups are Duncan Designed Mustang pickups like what they come stock with.
The stacked knobs were from an early Squier Jaguar long scale that had a warped neck.
Very cool! I would love to hear how those 2 bottom pickups sound... are they significantly more focused than the top two darker sounding pickups? Congrats on your very unique Mustang!