Couple of threads about tachs
http://67-72chevytrucks.com/vboard/s...d.php?t=503733
Seems a couple have had success fixing their tachs with the howtoalmanac fix.
http://67-72chevytrucks.com/vboard/s...d.php?t=470240
Another good thread on the big truck and gm sports salvage tachs
http://67-72chevytrucks.com/vboard/s...d.php?t=440489
Here are some more ideas
Honestly, I prefer an OEM look, which is why I held out for the C70 cluster. It was worth the wait haha. The GM Sports tach is a nice piece, and the guys who have bought it all like it, but it would bother me that its not 100% accurate in regards to the graphics.