caddy/bunny had westy wiring.... and cluster... now westy had no official diesel tach... gasser yes... diesel no on paper... i have seen one though.. with invalid part number and it was nib... people mod the gasser tach to work..
You can just swap in the tach, no need for the whole cluster. I think we used a tach out of a cabriolet, but I don't remember.
U can just swap the tach but that looks goofy because of the knob you set the clock with its best to just the whole cluster then u have a 120mph speedo. If u have an American built car get a gti cluster, use the diesel membrane on the gti cluster with converted tach or u can also just use the Dakota digital converter. If its a German car get a cabby tach, cabby racha are a bit harder to convert depending on which one you get, older is usually better