Fitted wasted spark driver into my redtop L8 ECU, modified my rev counter, but the rev counter doesn't work, i've bought a stack rev counter and that too reads zero. Everything else works fine. I've checked contiunuity between the ecu pins and the driver board to eliminate the possibilty of dry joints.
It is wired as follows

26 (cut) - Blue
25 (cut) - Purple
24 - Brown
21 (cut) - Grey
20 - Orange

Any Ideas ?