I think they make a decal set for the 67's but am not sure.
check out this link. ti says 67 to 70 and shows round and square type gauges
if you have to do it from scratch .... well be prepared to spend some time getting it right. I had to remove a speedo back plate(first picture) scan it in with a flatbed scanner, open the picture and trace the lines in autocad, scale it correctly (multiple tries on that one):banghead: then print it out on clear ummm over head projector slide sheets(the things that people used to make and then put on a light projector to shine on the wall or screen for business meetings) then compare to the original and adjust as necessary. for some reason it never scales right the first ohhh 10 or so times. your always close but just a little off. then you get to print it on vinyl. (or a sign shop does) mkae sure you have it in vector graphic's that the sign shop can use(ask them what they need) my little piece cost $20.00 to print, took him 3 tries to get it right on scale too! I've got about 20 hours on just the decal graphic's and another 6 hours on the paint for the gauge faces and painting the lines on them. but it was the first one and I'm sure I can shave another hours or so of of the painting and such. I am going to load up my inkjet printer, order the waterproof black ink and get some decal paper, print the speedo lines and clear coat it so I can try to match the vinyl and see which I like better. IF the decal works/looks the same or better it can all be done "ingarage" I.E. Cheaper, less time and I can do it all!