They're a waste. Integra's already have a tach. The only reason I would see people needing it is if their motor is heavily modded to the point that the redline exceeds what the factory tach won't allow.
Yeah I'm the same way, my buddy just got one and we had a argument about how stupid it was to me to have one. I'm glad I'm not the only one that thought it was waste. its cool but totally not necessary
