I defer to bigmoparjeff on the 67s - usually I can tell by the water valve on those models, but the interior is not so well known to me or the underhood placement of the vacuum reservoirs. My knowledge begins with the fuselage models. But I do believe 67 was the first year for autotemp, so that isn't a good sign either, since further iterations didn't seem to get any more reliable. I have been successsful only in getting the Autotemp II systems to work so far, but I really haven't tried hard to get an Autotemp 1 system to work, but it is probably doable with enough effort since some have done it. I do have a lot of NOS Parts for Autotemp 1 systems, except for the behind the kickpanel control units that sold out quickly after production ended in 1970 due to the rapid failures of them.