I just replaced my 85SD dash with a beautiful crack free from a 89 gasser. Everything works except the tach which worked before I took the dash out. I'm thinking that I missed plugging a wire somewhere.

The plugs at the tach are connected correctly as there is only 1 way to connect them. Is there another connection between the tach & the sender?

I have a 2 wire (black) junction block that is loose left of the center vent but I haven't found anything that fits.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.