I picked up a harness of a members 99. Came today and I mean that thing was beautiful. Clean and ready to go. I took my hacked up harness off and installed the newer one. I did everything right. Took my time. Double checked the connections. Put the key back in, pushed the starter button and nothing

So I wired the starter bypass back up and it fired right up.
Problem number 2. The set of gauges I bought off another members 92 had a tach issue. The tachometer wouldnt get up past 1500rpms. I thought and talked to you guys and some said its a ground issue in the harness. Well new harness and the tach still doesnt get up past 1500

What ground did I miss? Or could it just be a bad set of gauges? The seller said they worked fine when he took them off.