Greasel kit w/tank value?

[irishflyer]

Hello,
I am investigating buying a 300SD with dual tank Greasel brand conversion kit. I believe the only thing keeping it from running correctly is the switchover valve under the hood. I am not really into veggie conversions, and was wondering what the kit would be worth? Doesn't appear to be very old, the coolant lines to the tank work fine, has the filter and tank in the truck.
Just curious, making the car a bit cheaper is a goal, unless its not worth pulling it out.

Thanks!