We need to know what is meant of "dashes"?
Is it the gauge cluster or the full dash from door to door with the gauge cluster?
Full dash door to door from 80 - 86 and F100 up to the F350 are the same and will swap.
Now for the gauge clusters the same years & trucks will swap and bolt in but .....
The 80 cluster has different pin out for the plug for the cluster. They say the wires can be swapped so could be swapped between them.
The 81 - 86 clusters the only difference I know of is dose it have gauges or lights for charging and oil.
The do not swap as the number of wires to the plugs are different.
Dave ----