PS2 kits - use or get PS3 kits

Keep a couple and use the rest.   The PS/3 steam kit doesn't really give you much more capability than the PS/2 steam kit, so I'd use those first. The steam kits are designed to use PS/2 files and you get PS/2 capability.  You can use some of the PS/3 sound file (NOT THE CHAIN FILES), and add things like the quilling whistle.  The PS/2 boards are all the same in the diesel or steam kits.  If these are really old kits from early in the 3V production, you may have 1 meg boards, but if you bought them later in the production after a couple of years, they're going to be the 2 meg boards.  Certain PS/2 locomotives need the 2 meg kit.

Also, the standard PS/2 board can't be used for certain models, there is a special PS/2 FLASH board used in models with operating pantographs and for some subway models.  You can, however, use the new PS32 board to replace the PS/2 FLASH boards, there are special chain files available to emulate that capability.

The PS/3 diesel kit, OTOH, is a true PS/3 upgrade and includes stuff like all LED lighting, Rule-17 headlights, automatic cab light control, etc.  You use full PS/3 sound and chain files in the diesel kits.

I would keep them handy. I am using a PS2 diesel kit to replace a dead 5v board. Just swap the connector housings and everything plugs right in. Wish I had bought more when they were still available.

Pete

Well, the PS-32 is the repair board for PS-2 5V and PS-2 3V.  Slightly larger, but more memory and SF flexibility.   If all your fleet is large steam and diesel, you can keep a board, but the PS-32 won't be an issue as a repair part.  G

CAPPilot, how about option 3, sell them to me.