Aftermarket Volt gauge in stock cluster

[Steve83]

As much as you want. I nearly put an electronic speedo (still with a mechanical needle, but no cable) into Frank's '75.

 

[DirtDonk]

And if you look closely at the Baja Bronco featured in the movie "The Eiger Sanction" (hey, any excuse to watch that one!) you might notice that the speedometer is different.
I always thought they just made a typical Hollywood move and shot another vehicles dash, until I looked closer and saw it was a Bronco dash and gauge cluster. Very cool little mod if I remember.

Don't really remember the details since it's been so long, but I remember thinking how cool it was to have a trip meter!

Paul