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I just wired my failsafe gauge in last night. Here's what worked for me:
Illumination - connected to the violet (purple) wire coming off the dimmer switch on the dash. Works fine.
Tach signal - my car didn't have the "certified ECU box" described earlier in this thread. My car is a BRZ premium trim (no push button start, etc), and I think this is the commonality with the other member who didn't have this additional ECU box as well. I found the set of 4 pink wires (injectors) coming off the main ECU and tapped into the the one that was easiest to reach. Everything works fine. I had to set the pulses/rev in the SW to 1/2.
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