There's more than one surviving Link Trainer in the world: https://en.wikipedia.org/wiki/Link_Trainer#Surviving_trainer...

The gauges on that particular one have been removed; on others, they may have been replaced, or the radioactive paint stripped off, or the dose deemed low enough to not be worth worrying about.

Yes, it's sadly quite pointless without.

At another point, one of the others mentioned that the original gauges had to be removed because of radium in the dials. It's a bit sad they couldn't have been replaced with non-radioactive replicas.