Hello, here is what happen. After install Apexi Power Fc with Banzai Adapter . I figure that my TAC is stop working.
This step by step of what I did
FC Coil Installation How To

Is there anyway I can make my TAC working again. I really want to keep the stock TAC. Right now am using TAC on my POWER FC Command monitor. Thanks Guys

 

The Tach signal comes from the PFC, you need to check the connection at the 4 pin connector. The Yellow and Grey wire must be attached to each other, for the signal to get to the gauge.