Fuel and Oil Pressure gauges not working since body swap

[splehigh]

I'm having some trouble getting my fuel and oil pressure gauges to work after putting an 87 body on a 76 frame. I used the old 76 engine harness and plugged it into the 87 fuse panel on the firewall. All other gauges and lights are working. I tried other gauges with the same result so I'm pretty sure my gauges are fine. I have voltage at the gauge and I can get it to move to empty by grounding it at the gauge.

I tried grounding the brown sending unit terminal at the fuel tank sending unit but it did not move the gauge to empty like it should. I'm sure that wire is fine.

The brown wire goes into the firewall on the very bottom left terminal. The wire at the gauge cluster is pink at the top passenger side of the plug. I think the problem is in the fuse panel to the gauge cluster.

Any guidance would be appreciated. Perhaps someone knows of the differences in the gauge wiring between in 87 and 76. Thanks!