Digging up an old thread but that's what search is for isn't it? So I'm planning to buy a 73 240z in the next few days and it's missing it's speedo cog. You have the part number for the 19 tooth cog but what about the yellow 16 tooth cog for a 3.364 rear end? I would look it up myself but haven't boughten any manuals yet as getting the z depends on two variables out of my control.
I noticed this as well on a z I am looking to buy, we were testing the head lights and one was very dim almost out. My dad turned on the car to see if it would make a difference and it did and when he revved the engine it seemed almost like the lights were a second odometer.
http://portland.craigslist.org/mlt/car/392795248.html Just thought I would share that link I can't jump on it but maybe someone else can. Seems like a good deal and just a little far fetched.