BE CAREFUL You likely forgot the ammeter wires which is the large black and large red witih eyelet terminals that connect to the cluster. You must bolt them together at minimum. THIS IS NOT FUSED other than the fuse link so BE CAREFUL
AND WHAT is it that you are working on? 1942 Supermarine Spitfire? 1928 hemi swapped Farmall "Regular?"
(Also post if applicable, whether you have a Ralleye or "standard" cluster)
You can download factory service manuals, and aftermarket wiring diagrams from MyMopar
On a totally OT, that Spit was flown by the late, great, Ray Hanna