Gordy,
If your aircraft are wired in the "standard" way for fire, you're good to go. All you need is a cannon plug and a female "cigarette lighter" plug. You can use either the 3 pin plug (PSD machine receptacle) or the Aux FM plug. They're pretty easy to make once you know what pins to use.
Once you have that, you can use the "12V" cord that came with the 495. The units can handle up to 33 volts, if I remember correctly. I've been using this setup with multiple different Garmin models (Pilot III, 296, 495) for 10 years with no issues.