Trim Gauge Installation

[nmoss]

I have a 1996 Evinrude 200. I have two wires coming from the sending unit white/tan and black and tan. I have connected the white/tan to the signal input on the gauge and I' not sure where to connect the black/tan wire. The old gauge was not working and the black/tan wire was just hanging loose with a broken connector. I checked the sender and I'm getting the proper resistance. I tried to ground the black/tan to ground but it didn't work. I'm also using the adapter for 1986 controls since I just re-powered with a rebuilt 1996 200 Evinrude.

Thanks ahead of time!!