1997 Chevy Lost Circuit

Hello, I have a 1997 1/2 ton, 4WD, 350 Chevy pick up. Circuit #20 controls: PRNDL (shift indication), Automatic Transmission, Speedometer, Check Gages and Warning Light. This is what the book lists. I lost speedometer, odometer, shift indicating position, and tachometer. This is a 10 amp circuit. Proving that my 10 amp fuses are good I would substitute in for the radio circuit. The radio comes on; the fuse is good. So using 2 or 3 different fuses, proved good by energizing the radio, #20 circuit is still dead. Any ideas? The ignition fuses under the hood all prove to be good also. The relays in the fuse box under the hood do not involve this circuit. I got a feeling the correction is going to be expensive or a rewiring nightmare. Thanks for any thoughts.