RPM Meter Doesn't read with chipped ecu, PLEASE HELP ME!!

[1999CivicSI]

I purchased an ecu not to long ago, and when i hooked it up, i started the car, and my rpm needle doesn't move. It doesn't read, at all. We have tried differnet ecu's, different harnesses, and we can't seem to find the problem, i have a 1999 civic si, and if u know the problem, or think u might be able to help, PLEASE help me..

[MKIII-Shoopra]

Tachometer please never say rpm meter again..

[doctorstupid]

Tachometer please never say rpm meter again..
i've seen it called "tack of meter" before.

[Skaterkid]

Check the wires running to the tach.

[STIBungy]

That would be either a speed sensor problem or a tach problem. That has nothing to do with ecu.

[djet820]

See if you messed with any of the wires running to the tach when you switched out ECUs.

[john]

If you put your stock ECU back into the harness does the tach work?