Where on the plastic end of the existing cable do I press? It doesn't have a tab like the one on the blue cable. Do I just squeeze the sides and pull the entire plastic assembly off with the cable? My cable has what looks like 2 tabs, one opposite the other. The cluster I want to switch to has the metal spring tab. If that is not compatible with the existing cable could I just swap speedometers between clusters? My Comanche is a 1987 not sure what the other cluster with the metal spring clip came out of. The current cluster in my truck is the bottom picture.