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Might be connected to the 4 speed transmission GT cars ? Much the same as the 69 staggered shocks. This picture is of a friends March 68, SJ, 4 speed car. I have the Marti and it does not list the tach as an option.
Tach was std equip on 4sp 68-69
I thought in 68/69 that big block 4 speed cars got the tach automatically with the 4 speed option, the tach was an option for R code 4 speeds in 1970. What isn't so clear is whether S code 68's got a 6K or 8K tach's ( my 68 S code came with an 8K tach but I've seen them both ways....)