I did mine and wanted to add some notes for reference in case someone else decides to do this.
I bought the SMD type LEDs which are soldered to a small piece of circuit board type material. The other common type has either an LED or SMD LED-on small square circuit board, soldered to two wires which thread through a plastic holder.
The SMD on a board type seems more physically robust than the soldered to wire type. I’ve had many dead on arrival soldered to wire ones where the wires broke off.
When pushing the LED bulb in, make sure it is in far enough. Some require quite a bit of pushing and jiggling to get it in due to the circuit board piece being slightly wider than it should be or has a “step” which is wider than the first portion.
When installing mine, I found two bulbs would not light up even though their polarity was oriented the same as all the other bulbs in the dash. After reversing them, it worked. These two were the left side bulb for the speedometer and the bottom bulb for the temperature. Mine is a 2006 EX, ymmv.
When I replaced my bulbs (2006 now almost 2021, 201000 kilometres) half of the original bulbs were burnt
The brightness increased due to switching to the LEDs allowed me to set the dash lighting to the lowest level. However, this made the HVAC controls too dim. I changed those to LED as well and it is now more consistent.
Photos below are the two types of LEDs. The first one is what I modified for the HVAC lighting and the second one was used for the dash. Notice the portion which slightly widens and can catch preventing the bulb from inserting fully.