Hi Brennie
It is a T4W, & I think that is the correct pack you show, and it does dim.
I did not change any in the central instrument cluster, (The Charging lamp should NOT be changed for LED).
You can see I did the Heater slides twice,(first time not bright enough)
The tacho, Speedo, and headlights except the fog lights & Indicators.
No real problems, but the side lamps needed to be fitted from inside the headlights ,as they would not go through the hole from outside.
Others have done the Indicators, but that again can present problems with resistance.
Good luck
Paul