Tachometer on a 95 Grand Am?

I have a 95 V6 3.1L Grand Am and it doesn't have a Tachometer on it... I was wondering... if I put an aftermarket tach on, is there a way to know the redline and such (it's automatic obviously).

I believe its red line at 6k my factory tach in my z24 with a 2.8 redlines at 6 and turns yellow at 5500

'93 grand am, i think my red-line is at 6

my 96 se redlines at 6

my 2000 redlines at 6200 rpms , will your new tach be digital or just a guage? You can phone gm and ask where the rpms redline at but I wouldnt worry about redlining , its got rev limiters to prevent it from ever redlining.