Gary Lewis wrote
Shaun - Thanks. That pic seems to go with the illustration you found. I really don't know how the computer is held in, but I guess we will find out.
As for finding a factory one, if the one that David found works well then I'll need to find another for Dad's truck. But David has found two, and Shaun threw one away, so apparently they are out there.
You could easily make a tab to hold the computer in place.
I actually found a third (now second with your purchase) one on Ebay. None of the three seem to have a retaining bracket, which is strange. It can't be anything too significant if none of those sellers included it. I'm thinking it's just a small tab, but I just can't recall since I tore that truck apart three years ago now.