I know there out there somewhere,I dont know where to find them.lead coming off ecm harness that conects to the gauge cluster.The ecm pigtail is a 1990firebird 3.1tpi.the gauge cluster side is a 1990 camaro with 110speedo,had a 5.0tbi in it.everything works but speedo and tach.Would the vss box under the dash need to be changed?I wouldnt think so.I'll keep looking.been looking for 3 days!