All that info is readily available in my build thread (click my sig).
It's six 194's for your gauges. and four 37's for you HVAC.

 

i realized that after i posted. thanks for all the great info. i used some from superbrightleds.com in me srt4. they were high power white 194's. made the needles look awesome. i will post pics later. i am posting from my cell phone now.

 

i have a 93 full size blazer an im trying to find out what type of bulbs are in my heater a/c controll box to light the buttons i have the out they are twist off out of pc board very small with plastic base they have numbers on the bottom looks like 70 or its an OL not sure anyone that could help would be much appercated thanx bill

 

Do you have an owner's manual? They usually list the reokacement bulbs in the Specification section but you can also look in the index in the back.

 

go to www.superbrightleds.com and look there at the twist lock ones. i want to say they are called neo wedge. they come in 3 4 and 5 mm bases. measure yours first or you can call those guys at superbrightleds and usually they can tell you. post a picture of them so we can see and maybe i can recognize by looking at them.

 

in my 96 blazer 194's do not work in the gauge cluster except for the middle one, am i doing something wrong? i found the 4 large bulbs on the back of my cluster that appeared to be in a housing to plug it into the cluster so i pulled the bulb and it is def not a 194 in there