i wanted to swap my original non-tach cluster for a cluster with a tach that i pulled out of a Bronco 5.0 from the junkyard. it all clipped together the same but when i switched key to on the airbag lit up code 12, then took her out for the first time with new cluster the ABS light came on. i expected to get a CEL and airbag 32 since thats what was on in my original cluster. is there something in the wiring between the 2 clusters? or should i start investigating the speed sensors?

where are the speed sensors located on a 2wd?