yes google crown vic tach install and click on drock96grandmarquis he has done a detailed write up that will help you
pin 48 on the pcm connecter is tach signal connect to your green wire from tach
I was looking at the drawings of the instrument panel ( gauge cluster ) in the 1997 Ford Crown Victoria Owner Guide and it doesn't have a factory tachometer
pop the hood and unscrew it
donno but it would be nifty AND useful to have!
Ther is not much between it but Victoria station is the closes. Piccadilly sation half a km futher.
It counts heartbeats.