Here is a thought. Why don't you remove your manual speedo drive in the gearbox and install an electronic speedo gear in the gearbox and hook up the wires. This will give you a signal for your ECU Talk.
Well here is my Two pence worth.
The rear discs can cool better as they are open to the air. As you will notice with fast cars, they have vents that actually feed cold air to the brakes. You don't have this benefit with drums as the part the brakes are in contact with is covered.
It seems as the fault was with the Dizzy. I opened the dizzy give it a quick wipe and rough up contacts and taped up a very brittle casing to the connectors. It has been running ok again.
The first cut makes you nervous, then its downhill all the way.
I will probably be the first to try this. If it works I will share it with you all. If it don't there will be a wanted ad for part :0
I opened up the dizzy today completely different to the one I took off a Micra. Anyway I put some insualation tape on some of the plastic casing over the wiring connections as they were cracked(they are not rubber cased like the micra dizzy).
I put the old one back in the car. It ran for a...
I have one. They may have been put on the imports and Automatics. Here is the picture of it on my car. http://www.micra.org.uk/attachments/dsc00603-jpg.24091/
Do you think it will work the conversion?