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Brothers Performance Speedo Calibrator - Who has experience?

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Most of those are the same box re-named for whomever sells it, and if you mess with the dip switches enough, it will be dead on. I have the Dallas mustang speedcal and it tweaks out a bunch.... Jumps 3-4 mph randomly, it's probably a ground issue, haven't had time to mess with it. I tried going off the sheet that comes with it, ended up playing with the dip switches until it read correctly referencing my gps for speed. It's dead on at all speeds, works well if I could just get the ground fixed.

Edited by Mikey94gt
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