My speedometer and odometer go out driving down the road already replaced the computer it didn't work if I shut off the truck they will come back on but then shut off while driving have to shut off truck and restart to get them back any advice would help thanks

Try removing a cleaning the contacts to each fuse in the under hood fuse/relay box with abrasive cloth. On trucks, they often get really corroded. Likewise, try cleaning the connector going to the Instrument Panel Cluster (IPC). If the problem persists, the IPC may need to be replaced--they aren't real durable these days.