Aftermarket tach still doesn't work?

[pauls340]

After all the time and $$$$ putting a new under dash rallye harness in with the upgraded DemonIVR, I start the car only to find the tach is still stuck on 2000rpm. My problem I don't understand electrical stuff. Is there any simple check?

 

[70aarcuda]

did you wire the tach in accordling to the instructions?

 

[KitCarlson]

Is the tach wired to the coil (-)?

 

[pauls340]

I will double check that tomorrow. Thanks