My '87 Westy Synchro 2.1 WC has 125K with a rebuild last year.  Engine work resulted in new radiator, major hoses and water pump.  Bottom line is: "I don't want to break down in the tules and have it hauled a zillion miles back to a repair shop".

Question is, of the electrical/electronic sensors that are still original, what would a paranoid enthusiast have replaced, thinking that the old ones could then be carried as spares?  

What should a spare ECU cost?  Are used ones available?

Thanks,
Tom Salicos
 

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