Jaguar Bass replacement preamp. HELP!

[vinorange]

I recently got a not working CIJ Jaguar Bass and after a bit of fettling, it's working fine.

The stock preamp is a definite area that people seem to upgrade and I want to drop in a Bartolini NTBT 918 2 band preamp.
The only thing is, I'm stuck.

I'm ok with the bass / treble pots but the remaining wires green (to volume pot normally), yellow (to blend pot), red (positive) and black (negative) don't correlate with the preamp wiring on the Jag - I can't figure out where the green and yellow wires should go as the Jag doesn't have a blend pot.

Hope someone out there has replaced the preamp in a Jag and can give me a pointer.

Thanks