The 1942 monitor is IMHO one of the best classic Amiga monitors!
If you're not running OS3.1 or higher, you should get the file 1942Patch.lha from Aminet. This includes a new overscan preferences binary and some other stuff.
The above patch is an old official release from Commodore - I believe it was shipped on disk with some of the 1942 monitors, so this should be the safest way.
Also use the "Overscan" button on the monitor, and don't forget to put VGAOnly in devs/monitors!
I'd also recommend you to try as far as possible to stay away from DBLPAL and DBLNTSC. Basically, the only flicker-free mode that is worth using is Multiscan: Productivity. Using only this and PAL is the best way to utilize your 1942 monitor. With the above patch you can get 656x495 pixels from the Multiscan driver, which should be enough for a 14" monitor.
If you're still not satisfied after that, get MonEd from Aminet which lets you edit most things in the monitor drivers. But beware - it can ruin the monitor if not used carefully!
