BTW, the "better one" Ames is selling is produced by "The Parts Place"... Ames even didn´t bother to erase the Parts Place sticker on the box when I purchased it one year ago. I bought two tachs for my 68 400 (one from PY because it has the correct bluish bezel for 68 Birds and the one from Ames/Parts Place with black face plate, both have real glass and both are nearly similar concerning quality); finally I went with the Ames/Parts Place tach because it was a tad better... In addition I didn´t like the sealing silicone that was pasted on the lower side of the PY tach because for painting I had to disassemble the tach and the silicone paste was only hindering... In addition it won´t prevent humidity to get into the tach (but surely to get once again out...)

I already have posted some of these pics before but never mind (once again occupying some space on this forum )...

LH side is Ames/The Parts Place; RH side (with bluish face plate) is Performance Years:



The one with the silicone is PY, the one without is Ames/Parts Place:



Ames/Parts Place:



Performance Years:



Here´s an insight in the Ames/Parts Place tach:







Below is the template I used for installation although both tachs had templates included (both were way off; think they were meant for GTOs). I copied it some time ago on the web, whoever made it did a very good job... Thanks a lot! Nevertheless, it´s the template for the tall style hood tach that was used 67 and early 68; I have the low style tach so I took only the measurements for locating the center of the tach hole (I marked them on the drawing with red loops) and went on from that (the low style tach needs only 3 fasteners in contrast to the tall style one who needs four of them.)



Here´s the hood after preparing for the hood tach and for the paint job: