Dick, I don't know how much good a tach will do you with an automatic.
Unless you do alot of manual shifting in mountains. My camper had a
tach when I bought it, but it doesn't effect the how hard I drive my
camper. I rarely rap out my little 22R-E with a 5 speed. I like to
take it easier as much as I can. When I am going through mountains I
don't need a tach to tell me when to shift, you usually know. I just
use it more for curiousity. Waiting for spring...Nate