in my 6th gen DX cluster (no tach), i just installed one 194 bulb and two 24 bulbs. i don't know if the two 24 bulbs are lighting up yet... still daylight and they seemed big when i was putting it in the socket. but i can see the 194 bulb light up. 24's may be too big for this cluster. i might have to get 74's instead (which i can't find any in amber color...)