I see you posted while I was typing. Looks like you have a donor cluster with a mechanical gauge. Just buy a tube kit and install. There is NO adapter to turn the mechanical gauge to an electric gauge.
Unfortunately just buying a tube kit didn't get the job done. Looks like I'm going to have to buy an adapter to add to this to get it to work. The kit came with a male fitting that will fit into the female fitting on the cluster, but then it doesn't have any fitting that will fit into that. bummer
