Yup, A digital NX1600 cluster in a 89 240 coupe. It was hard, believe me, but I did it just to put away rumors that it couldn't be done, and to shut a few people up. The wiring was the hard part, Thanks to Fireblade RX-7 for all the wiring help, dude your the best. I didn't need to use the NX speed sensor, or the temp sensor, because I have a twin cam swap with a 89 single cam tranny, and I guess the 89 tranny speed sensor puts out the same pulses per revolution as a NX speed sensor. But any way here are the pics.
The rough harness right after it was made
Modifying the cluster garnish mounting plate thingy
Had to cut away plastic at the base and the top of where the cluster sits because it the cluster is so tall it was hitting the bottom and the top of the cluster pod.
Cleaned up Harness
Cluster Mock up
Here are some shots of it/me in action
The car it was swapped into