Ok, I got it installed as a "replacement" at this point. In other words, I have yet to wire up the added functionality of the hazard button. But it couldn't be easier to swap the 2 clusters.
First, a "mapping" of the existing wires vs the wires in the FJR cluster:
They are nearly identical, save the reversing of one Start button wire being White\Blue vs Blue\White!
So you simply use a small awl point to release all the connector prongs from their connector housings on both harnesses.
(If you don't find them releasing with little effort, you are not doing it right. Don't damage the S10 housings. You are reusing them)
Once you have the new FJR harness free of its connector housings, it should look like this:
Now follow this mapping and reinsert the FJR connectors into the S10's housings:
It will result in this finished harness: (note the 2 unused Hazard wires [Blue-Red Stripe % Brown-Green Stripe])
I inserted the hazard wires into the unused FJR sealed connector and heat-shrinked the new harness, leaving the hazard connector ready to be plugged into whatever I rig up for unswitched hazards. But the new cluster is functional for all OEM S10 functions now. And that Start rocker button feels just as cool as it did on the FJR I drove.
EDIT: Note, that if you want "switched" hazards (where key must be in on position) you simply tap into the green wire (right side blinkers) with one of the 2 wires coming from the hazard button switch in the cluster, and tap into the brown wire (left side blinkers) with the other wire coming from the hazard button. By doing so, you have bridged both side turn signals when you push the hazard button in. So your blinker switch is now a hazards switch, regardless of which direction you push your blinker switch. To return your blinker switch to normal operation, you simply push your hazard button again, resulting in breaking the bridge.
Also note the green and brown wire are located conveniently right in the same bundle of connectors that are collectively in the rubber boot\sleeve smack dab in the center of your wiring compartment behind the right side panel. Couldn't be less messy to accomplish.
Borrowed pic from previous poster, Behmer, of what the blinker connector looks like:
Now time to go research
