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Hey Gerard,
12 is the common for the dizzy points and 21/22 are the 2 poles. As long as you get alternating action as the dizzy rotates you are fine, as that is what triggers the two banks of injectors in pairs.
Brad Anders web page has the full info for diagnosing each component thru the ECU connector on the FI harness. Note that there are only 25 slots, but that 3 are not used, making a total of only 22 wire terminals available at the ECU connection.
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