Add reverb to vibrolux

[überfuzz]

I'm building a vibroluxish or just fenderish amplifier to which I like to add reverb. I have a reverb tank that I like to use. I think I have a working reverb circuit as well. This thing is, I don't know how to merge these two circuits properly. On the attached schematics there are two resistors R8 and R9. I guess I can connect my reverb-circuit in parallel to this resistor. right? If so, how to a match the value of R8/R9 to fit my build?

[überfuzz]

By the way, if anyone here has a simpler set up for the reverb circuit suitable for 9GB2C1B rebeverb tank it's also welcome.

Cheers!