Is there any way I can mount a tach in the Impala?

You can fairly easily mount a 2 1/16" tachometer in the black bezel that surrounds the instrument cluster. Cyberdyne (1-412-258-8440, 1-412-258-8442, fax:1-412-258-8342) gauges are digital, featuring red LED displays. They have no logo of any kind, which contributes to the "factory" look, and are completely dark when the vehicle is off. These are 2-1/16" round gauges with black bezels and you can install them directly into the black dashboard instrument cluster bezel on either side of the steering column. Alternatively, you can get almost any analog tachometer that is less that 3" deep and 2 1/16" wide and mount it in the same location. JC Whitney carries a unit (81NP1446W) that does the job nicely: no writing on the face, black bezel, and backlit. You can also use the two screws that hold the black instrument cluster bezel in place as mounting points for a tachometer. For instance, you could mount the base to one of these screws and turn the face upside down. It would restrict a bit ...  more