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test light on battery POSITIVE
use T pins on the Injector connector
use a test light connected to battery positive , with engine at idle ,
connect to each of the injector wires
1 wire will have a signal which will blink the light , faintly ,the duration is only about 2ms
that is the pin to connect to the MPGuino
or use a scope
this is what you will see on the correct pin
connect the scope ground / negative test lead to the battery negative
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