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You need an af1 or af2 to use the auto tune feature.

AF1 will require at least a 1-2 splitter.
AF2 will use a different plug on the mini5 allowing the BLink to be plugged in as well without using a splitter.
 

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They say the af2 is more accurate and consumes less power... but they both do the same job and af1 can be had used for cheap. Cameron Jones had some used ones on Facebook. Believe it was $150 and get a new Bosch sensor at the auto parts store.
 
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