Instrument Voltage Regulator 68 Cuda

Dash is completely taken apart now , all was working before I took it out over a year ago.
I 'm just upgrading some stuff while I'm waiting on the body shop.....
I did look up a horn relay for it and it looks identical , they have the same connector arrangement .
Now I want to upgrade the instrument voltage regulator and the ammeter

Oh yea..... Its a 68 Barracuda

Donnie