Hello, I just did a ls swap out of a 2000 teggy on my 94 eg hatch and the tachometer isn't working . The ecu I used is from a 94 ls. Need help. Thank you

 

first off pop it out make sure its not just a connection issue then use a multimeter on the wire locations to make sure all are generating power, do the easy possibilities first.

 

What I've been told to check it the blue wire running from the distributor to the driver side firewall but then I also heard '00-01 teggys are missing that tach wire going to the driver side firewall .it needs to be added. I just need confirmation. before I do it.