w terminal started in 82 w shift light and dynamic oil pressure.. so i really doubt one was made... but same token years ago myke_w had a westy diesel tach cluster that was factory.. part # and all.. but did not exist to look it up.. 0 miles.. 5k red line.. not a "made up one" from a gasser..
Dang thought there was one on CL but is for the 81 Caddy. Square block not the rounds. Kind of steep in price at 200 bucks. Might be a tad crazy priced.