Third party gauge problem in FS2002

I have been trying to add the DHC2 Beaver downloaded from simviation into FS2002. So far everything works fine except for the gauges (from the gauges.zip file, which I have also downloaded, extracted and placed in FS2002's gauges folder according to instructions.
The problem is that, when I select the aircraft (DHC Beaver), FS2002 gives me a series of error messages saying that FS2002 was 'unable to load some 3rd party software' and referring to the FS2002 Readme file. The latter doesn't really seem to give any advice on what the problem is or what to do about it. Although I am able to continue loading the aircraft - and fly it, it has a 'stripped down' instrument panel - which makes life "interesting" since a number of switches and controls are missing!
Has anyone experienced this problem and found a solution, please?
The problem is that, when I select the aircraft (DHC Beaver), FS2002 gives me a series of error messages saying that FS2002 was 'unable to load some 3rd party software' and referring to the FS2002 Readme file. The latter doesn't really seem to give any advice on what the problem is or what to do about it. Although I am able to continue loading the aircraft - and fly it, it has a 'stripped down' instrument panel - which makes life "interesting" since a number of switches and controls are missing!
Has anyone experienced this problem and found a solution, please?
