just a guess here, but I would think you can check the fluid level on the fluid tank itself, most have a mark on them to show full,
as for gauge cluster, odds are its a discontinued part, but you may still be able to find a good used one, from salvage yards, Ebay, or else where on the world wide web
Might even find someone that sells retro fit gauges too, if you do some digging online!
if you have a GOOD dealer near you, you can also try asking them about gauges, they might know where to find one either used or possibly even new
but odds are they won't be cheap, no mater where you find one/if you find one for sale!