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Are you planning an '84-'85 5 MGE engine swap?
ECU ..WITH those wiring harnesses will work fine.

'83 ECU is different as is the wiring harness.
There will be other differences going from'83 to '84-'85 engine.
Vacuum hoses,for one.
Your '83 external fuel pump MAY work.
 

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The Megasquirt uses a minimal number of sensors to run the engine, so a lot of any year engine harness will be unused.
 

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85 ecu is only different in that the TPS is full range, otherwise not much gain. If you go standalone yeah jsut do whatever you want. Add/remove wires at your leisure to make it all work, though it is no small task.
 
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