Yeah, I could check the diode bias with a multi meter but they are so small it is easier to just flip them around than try to hold two probes in the right place while trying to hang on to that little socket.
With 50/50 odds, I only had to flip about 75% of them.
Hopefully I won’t have to replace them again, but I have plenty of spares now.
I also modified the cluster mounts so I don’t have to reach around the fuel tank to get the cluster out. I still have to make some little clamping brackets but that should be easy enough to do once I get the proper aluminum bar stock.