J Bot

My grandpa has a 1990 Silverado 1500 and some of the gauges stopped working, fuel, battery, etc. Speedometer still works. We have been to multiple salvage yards and had no luck. Just wondering if anyone has any knowledge on how I can either fix the current gauges or an online shop that specializes in selling older model discontinued Chevy products. Note: I took each gauge out and cleaned them with some contact cleaner but that didn't work. Any help would be appreciated.