twilight thanks for letting me know that the instructions were not useful, I quit searching around for them and decided to take some closer looks at some of the pictures on those web sites and was able to get the decoder installed, it really is a tight squeeze, even for the DZ121. The only issue I have now is that it runs rough in reverse. It runs fine going forward, but when going slowly in reverse it lunges. Can't figure it out, anyone have any thoughts.
Thanks, Freelancer