After a long break, I've had a couple of days mucking around with the cluster that @Rossco sent me. I unfortunately found that removing the needle off the tacho, destroys the bearings.
Bugger! They have designed the collar to protrude under the hub of the needle, so there is no way of removing it, without the whole spindle sliding out.
This will make it a lot harder to conduct repairs on the PC boards of both the speedos and tachos.
So, if anyone has had success in removing the needle please let me know how you did it.
I have also found that the TD42 diesel cluster loom sockets aren't compatible with the RB30 and TB42 clusters. so I will have to find a way to make adaptors for the test bench. I'm guessing the RD28 is different again.
On a positive note, I redesigned the electronic speedo signal generator to produce a stronger, smoother output. I also found that a 10k ohm resistor across the output kills any feedback voltages from either the sig gen or from the speedo, which is a bonus.
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