Lots of mis information here..... you dont remove the dash cover. The speedo and tach are electronic, no cables. You remove some dash trim, pull the cluster part way out, remove electrical connector(s) on the back and then remove the cluster to replace bulbs. I suggest replacing ALL the illumination bulbs (5 is I remember correctly) while it is out.
Not a bad job really, just a little time consuming. I think there is a sticky here detailing the process.
05 Taurus SEL Duratec - my daily driver
04 Taurus SES Duratec - wifes car
95 Taurus GL Vulcan winter car
Toy #1 - 86 Tbird 5.0 (original owner) - LOTS of mods
Toy #2 - 88 Tbird Turbo Coupe - LOTS of mods
02 Pontiac Grand Prix GT
67 Honda 450 Super Sport - completely customized