1998 Dyna Convertible Tach and Speed guages
 

I am looking for new/used speedometer and RPM gauges for my 1998 Dyna Convertible. previous owner stored bike outside the the gauges are very difficult to see.

Do you mean they're difficult to see because the lenses are fogged/scratched/cloudy, or because they aren't illuminating well? If it's the lenses, you can probably clean them up. There are several "glass restorer" products that work well, and sometimes just regular rubbing compound will make them completely clear.

Additionally, there are several vendors you can send them to, and they'll take them apart, upgrade to LED lighting, clean everything and send them back.

The gauge faces have faded so badly and with poor lighting, they are almost useless in the dark.. Any idea where they could get rebuilt?

Thanks

I'm sure this guy can help you out...
http://www.powls-speedometer.com

You could try these:

https://zeescustomsinc.com/harley-davidson-gauge-mods/
http://www.bluegauges.com/motorcycle/harley.htm
http://harleygaugemods.com/
https://www.eyezongauges.com/

thanks
 

Hope it works out! If you end up sending them out, take some "before" pictures to show us along with the "after" shots!