Help: SR4 & Bartolini TC3 Wiring

After 28 years of dreaming of owning a Stingray I recently bought a ’78. I’m really happy with it, it sounds and feels great. However the original preamp have been replaced with a Bartolini TC3, and the two tone controls are not in any way connected. There is a 3-position switch which only functions as a on/off switch. Hence, there is not much versatility tone-wise. (I also got the original preamp, a Black Epoxy Type 2, when I bought the bass but one of the capacitators (?) seems to be broken)

So my questions are:

1. Is the TC3 even suitable for a Stingray? Any opinions on it?
2. Is there a way to connect the tone Control pots?

I’m not all that good at electronics, but I did look in the wiring diagrams for the TC3 and can not find anything that looks like the wiring in my bass. Also googled around a bit, but couldn’t anything about using a TC3 in a Stingray.

If it turns out that the tone controls aren’t possible to connect, I will definitely consider replacing the TC3.

Thanks in advance,

Johan
(Sweden)