I was asked what year my A1-B in which the JPI 900 was installed - a 2004. I do not have install pics (my local avionics and airframe shop, Sparkchasers, at KJNX did the install. It fit fine in my 2004. My Husky was one of the last "old wing" airframes built - #2280. Thus far, I am happy with it, and I have about 1100 tach hours on the airplane. I did have my Hobbs meter fail, but that is really a non-event, since it is really only used for keeping track of hours flown. When the VM 1000 failed, it meant that the tach failed too, but the JPI allowed setting the tach at the correct total tach hours when the 900 was installed. FYI, the JPI900 is more accurate than the VM1000 and has more info. Also the 900 logs engine info electronically, which can then be downloaded for analysis. This is very useful if you use someone like Mike Busch to manage your engine maintenance. FWIW, Aviat recommends the JPI900 as a replacement unit for the VM1000 (I asked my avionics shop to call Aviat before ordering the JPI unit and ask what they recommended).