Yello mechanical light on ,in dash averthing to go ok

Have you considered it to be the light bulb itself?

in canada? with DRL?
is the charge (battery Light on running)
nice photo but do name all lights, i see idle is at 800rpm good.
i see check engine light there, top left. so you need to scan PCM
using any scan tool
that is first.

DRL can shut down for other failures one is charge lamp. on.
if charge lamp is on , do not drive far, or it will stall and battery will discharge and be stranded. (till AAA auto tow is called <jumped)

probally be a good idea to have a local shop run a fuel system check to eliminate alot of wasted time or money. its well worth the time to have it properly checked by a trained mechanic. alot of engine problems the computer picks up wont be noticed at first and can lead to expensive repairs

Wath picuture is in yello light?

it is malfunction light have scan done for fault codes

I had this problem as well, I was told that the tires didn't have ample enough tire pressure.

that your check engine light

It Could Be The DashBoard Switch Itself Or The Light Sensor which is located Near The Bottom Of Your WindshieldOn the dashboard near your GloveBox may be blocked.There are no fuses for this as it runs directly off your Body Control Module which controls all your dash displays and interior lights.

1998 Chevrolet Blazer S-Series Stereo Wiring Constant 12V+ Orange Switched 12V+ Yellow Ground Black Illumination Gray Dimmer Brown Antenna Right Front Front Speakers 6 1/2" Doors Left Front (+) Tan Left Front (-) Gray Right Front (+) Light Green Right Front (-) Dark Green Rear Speakers 6 1/2" Rear Doors Left Rear (+) Brown Left Rear (-) Yellow Right Rear (+) Dark Blue Right Rear (-) Light Blue