Okay.. I had a post about this a few weeks ago and i never fixed it.. Now my dilemma is I wanna go to the track Friday night, but I cant go because my tach is off which is causing VTEC not to engage at the right rpm... My VTEC controller and Autometer tach are the same RPM. I have the Autometer hooked up to the blue wire at the dizzy. I have the VTEC hooked up to the white wire at b15 on the ecu. It worked fine like this for a while, then all of a sudden it stopped working, I swapped distributors, ecus, everything, and its still there. I have no clue what it could be. VTEC controller and Autometer tach the same, stock tach is 1000 rpm faster, which is causing me to not hit vtec when i should.

Now my new idea, could I hook the vtec controller up to the stock tach wire? If so which wire is it behind the cluster or whatever. Cause I need this fixed. Can I put like a resister in the wiring or something, you get my point, lol, I dont care how its fixed I just need it fixed. I have tried everything I can think of, I am desperate, any ideas. PLEASE!!

 

Everything I've ever read says to take the RPM wire off the ECU harness B15/B17 thats gonna be the exact same RPM you ECU is seeing for RPM for rev limit and V-tec. I've had mine that way for years and no problems but I also dont have a stock tach. Still think you stock tach is off seriously. My accord I had would be way off my autometer also so thats my evidence

 

don't use the stock tach wire. i had hooked up my aftermarket tach to the stock tach wire and the stock tach constanly bounced. once i removed the aftermarket tach, everything is fine again.

i would seriously connect the vtec controller to the dist. (blue wire).

 

Come on, I know im not the only one to encounter this problem. My Autometer tach and vtec controller rev WAY too slow after 5000 RPM. and too fast before 5000 rpm... I know my stock tach is right. Help me out guys. This is hurting me bad. I have been so frusterated the last few days. Im out there just trying to get it and cant. Can I have like a bad ground causing it, I doubt it, cause I have went through them about 10 times, can i be getting interference from something? What gets me is how my stock tach is right.

Something else.. I unhooked my stock tach, and took that connector and hooked the tach wire to the clip on the cluister, and it reads way off STILL. So I mean its something with the tach and vtec controller or a wire somewhere. I just need to know where I can look for a problem like this..