i got a 99 ls1 pcm running a 6.0 in a 97 (lt1) style firebird. the tach has work previously. just swapped in a 99 pcm to see how it compares to the 01 one for the transmission.
anyways everything is working cept for the tach. the scan tool does see rpm, just nothing to the dash
any ideas? not really sure where to look. the rest of the dash does work. i do have to do a case relearn, would that affect the tach?