Mine is mounted between the column and the ashtray. Found a position where it is not in the way. Fits great. I rely more on the shift light for high rpm shifts anyways.
I have the same dash as you and took out the plastic delete between the turn signals and warning lights (your top picture). I found a tach to fit in there and mounted it in there. I used this tach. I don't have a photo of it mounted yet.