There's no aftermarket vm that'll look "stock, but AFAIK, from what I've been told, you can get the vm from a '90-'93 gauge cluster and it will fit where hte ammeter is. You will have to cut the ammeter wires in the cluster connector and splice them to switched 12 and ground. Otherwise, most aftermarket vm's are the same.. You can spend $12 up to $100 or more depending... I like Autometer gauges, they come in all different styles, and they have matched gauges for almost everything. Nordskog gauges are more expensive, but they use stepper motors in their analogs, so they are really accurate, and they have user-defined warning light outputs. They also make digitals. It's all a matter of what you want. They make pillar pods that will fit our trucks - someoe here has them, if you could jump in... Get a Summit catalog. They have a whole section of gauges.
Matt {peace}
Matt {peace}