im trying to get my 3rd gen cruise control and speedo to work with my lt1/t56 combo. If i use the B8 (VSS OUTPUT) from the pcm, and wire it to the speedo. the speedo works great. but when i rewire it to the 4out buffer box.. I get nothing. ..

im looking for a schematic to show me where and how the B8 wire is used.
I see that it goes to the cruise module/instrument cluster.. but i dont have any more diagrams to show me what happens next..

thanks.