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I would definitely go DEFI BF gagues.....not cheap....but they will all link into the control Unit II which records everything...gives peak, playback, and gives them power from one source making the install much easier.....as they link via daisy chain from one to the other.....and their tach will read up to 11k rpm....so that is another reason why to go with the best gagues i have seen to date....i have the whole line installed which is 7 gagues + the AEM uego running off the EMS to make a 8 total in mine