Loosen the negative cable at the battery terminal and then lay the cable aside in such a manner that by some chance it touches the negative terminal it does not close the circuit and provide current to the car components. After that, slide back the cluster bezel and cover, thereafter unbolt the screws which hold the tachometer onto the cluster, gently tug the tachometer backwards and further unfasten it from the cluster. The last step to the process is the installation which takes palce in the reverse order of removal.