gauges not working, 87 Daytona Shelby z with 89 electronics

wanted to go back to the 87 electronics but things didn't work out so I put the 89 T2 stuff back in. after swapping back (Underhood and dash) everything but the gauges work. I've spent months on this issue and can't figure out the issue. it was working just fine, before I put the 87 stuff back in. I'm at a loss, even took the dash out to see if I missed a ground or connection. can't find anything, even swapped 3 different gauge clusters..... all the fuses are in place.

it's driving me nuts! anyone had the same issue?

thanks.

what gauges dont work? all? one? do you get lights in the cluster when turning on the head lights?
speedo work?

none of the gauges work. dash lights work just fine.

checke grounds?

every ground I can find is good

If you lost every single gauge. they only think they all share is a connector and a ground