Does MP Orange Box Mess w/ Tach?

[FY1Cuda]

Saw The4ork's post about his tach and CP says that he probably needs a tach adapter.  We have a Mopar Perf orange box and a tach w/ an RT-Eng circuit board.  When the car is idling, the needle will fluctuate, sometimes down to zero.  Does the orange box interfere with the signal for the tach? Anyone know?

[Chryco Psycho]

the orange box only single fores the plugs so no it should not affect it

[FY1Cuda]

Thanks for the info.

[LAA66]

 Just a note the FBO box affected the RT Eng. tack on my Challenger. It reads around 2000 at idle but re calibrates once the engine RPM's are up. I think they called it double spark at idle or something like that.

[JayBee]

I have an RT-Eng tach and an MP orange box. My tach works fine, proper idle reading all the way up to 5k and no fluctuations at all.

[FY1Cuda]

Thanks for chiming in.  Maybe a loose connection.