4 questions:

1. Will the speedometer head interchange 86-93? Plug looks the same.

2. The later ones have a rod bent around the back. I'm guessing that this is the compensator rod I've seen ref to. I'll research that here.

3. Will the gauge clusters interchange? They look the same on the back 3except the later ones have 5 pins instead of 6 on the left side.

4. If you swap speedo heads AT to stick, do you also swap the speed sensor on the rear axle? (as the gear rations differ: 3.73 vs 3.31)

I read some of the threads on this but none are clear about interchange.
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a few 1985-92 240s & 245s - parts cars & drivers