Dash warning bulb sizes?

[Incognegro]

Generally I have all interior bulbs in LED.

When I change gear at the RPM limit I get a beep, but no light comes on? OCD tells me there must be a light to indicate to me also. I take it this is because there is no/broken bulb in the holder in the dash? Could someone please tell me the bulb size I need in this area please as I'll have one fitted soon.

I plan on putting a 'red' LED there.

Thanks in advance.