How much would it cost to get an instruments cluster on mustang?

New 2005 mustang instruments cluster plus installation at ford dealership. How much?

Around $275 for the cluster itself and another two to three Benjamins for labor.

Let me call my Ford dealer and ask them.

The parts department will quote their price when you ask them.

Why are you going to a dealer? Get an independent shop to install it for you. It will save you more than half of the dealers quote.