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Well, this turned into a longer and more expensive project than I was hoping.
I had the ABS controller installed, which involves cutting hard brake lines and flushing the brake system. $798 for 3 hours of labor by the dealer's master tech.
The odometer was still frozen. Brought it back to the local shop that programmed the mileage. They insisted that there was still some hardware incompatibility, though they could not point to which hardware, specifically, since I'd already replaced every ECU that could possibly affect the odometer.
So I ran an experiment. I bought a second used cluster and had the dealer install it. It ticked up! This proved that there are no remaining hardware incompatibilities between this Canadian FR-S and a US cluster.
I got a refund from the local speedometer shop and sent this second US cluster to GeraldJustProjects to program the correct mileage. Unfortunately, the dealer could not get it to complete the Techstream registration procedure that pairs it to the main body ECU's immobilizer after it came back from Gerald. The master tech tried everything he could think of for two hours, but it just would not complete the registration procedure this time.
So the cluster is now back with Gerald, who can hopefully figure out what went wrong when he programmed the mileage that's causing the cluster not to be able to communicate with the main body ECU.
It seems that these first-gen clusters are tricky to program the mileage for. This is now three experienced cluster shops that have not been able to do it. So far; hopefully Gerald can figure it out.
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