1997 Chevy Astro Guage Problems

You said you've already spent alot of money on this problem, can you tell us what you've done so far or had done?

All I can do is tell you to check the basics, when the gages refuse to work, check for B+ and ground at the gage cluster. B+ should be gage fuse #4 10 amp. The ground for the cluster should be at the thermostat housing. You can take the grounds loose shine-up the end with a piece of emery cloth or something, hit the mounting surface a lick also, put everything back, see if it makes any difference? I don't usually get that lucky, but, you never know.