Fix or replace LPG regulator?

[Roundhead]

There was still some LPG in the (old) tanks on my 1971 Overlander.

After reconnecting them, I turned one on, then the other. Gas seems to be leaking from the regulator. I don't know whether it's an "automatic" unit or not. It has a dial with an arrow to indicate which of the two tanks is in use. I messed with it a little, but couldn't get it to stop leaking.

Is this is an item subject to repair or if it should just be replaced?

The screws holding the regulator case together are rusty, but otherwise, it doesn't look like the regulator has been handled roughly.

If I replace it, can anyone tell me about their chosen regulators? I see that Inland RV is offfering a Fischer automatic LPG gas regulator for $165.

Any other place to check?

Thanks!