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I assume that the KLX135A is a VFR only gps. What would it take to make this plane IFR certified? I don't have any IFR training at this time, but I would like to.

Yes, that's a VFR GPS. An old one at that but still not bad at all. There's not much req'd to make the bird IFR as I have found out. I'm planning to do the same thing (buy a VFR bird and convert to IFR). Assuming there's no leaks in the pitot static system, it only costs ~$200 (depending on what part of the country you're in) to get the pitot static system, transponder, and encoder certified for IFR use. I intend to install an IFR Approach GPS such as a KLN-89B or Garmin 155XL. Both can be bought factory refurbished and installed for around $2k. Something to think about if you plan do get your IR with the plane. Also, I suggest you pay attention to the layout of the instruments. The older planes don't have the standard 6 pack (as I think someone already pointed out).

I PMed you my cell phone number. Give me a call or shoot me an email and I'll give the guy a call about the TX plane.