Time to start tracing the circuit... something's most likely burned out or possibly torn. Also check the sockets where the plugs connect to make sure the soft circuit isn't folded and that the copper contacts are intact.
If it's the same type of cluster as your original (turbo and turbo or n/a and n/a) you could swap all the gauges over to the shell that's functioning properly (You can do it with a GE to GTE or vice versa but you have to cut a trace and add a jumper, IIRC). The only thing which may not have a connection on the back is the cruise control indicator LEDs, but there won't function in a pre89 anyway.
I've repaired the soft circuit on two of these in the past, it's not terrible but you have to take a lot of care to expose the traces without cutting through and then solder in a jumper without burning through.
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