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There is nothing "electronic" about the OD control (manual or auto) except the control relay — and the cluster wire is just for the Auto's "Upshift Arrow" (OD OFF) light. But that might pose a problem, since the '81's OD ON light is tied to ground, so it lights when it gets power in parallel with the solenoid.
However, the '86 up Auto arrow light (OD Off) is tied to +12V, so when the solenoid gets powered (from the relay), the paralled indicator wire puts +12 on the other side of the arrow bulb, turning it off when the OD is On.
Getting an '86 cluster wired in (just for that arrow light) may be more trouble than it's worth. But you will want an auto OD relay I think (maybe not???). Here are the Auto OD relay connections as they'd be in an '86...
1) Terminal 15 has 2 wires -- blue from fuse 11. And gray from one side of the shifter switch BUTTON (this turns the relay on with key on, and later lets the switch toggle it off & on as needed)
2) Terminals 87 and 87a (common) go to the light (yellow-red, 87a) and to the solenoid (white, 87). Relay ON, both wires get +12v. Relay OFF, both wires are grounded.
3) Terminal 31 has a black wire to ground. This turns the light on when OD is OFF.
4) Terminal 86 has a gray wire from the other side of the shifter switch button. This pulses the +12V from terminal 15 to 86, "toggling" the relay.
If your '81 shifter had a push-button shifter switch, it's wiring (for a manual OD???) should be OK at the OD relay side of the BLACK 2-pin connector under the carpet. The blue wire goes to relay 15, where it's joined by another blue wire from fuse 11 - and the black wire (gray from the '86 shifter sw) goes to relay 86.
I have more, but will stop here to see if I'm helping or snowing you. Post back please.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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