The two lamps for the tachometer work and the oil pressure and voltage meters lamps work. Neither of the lights for the speedometer or the gas gauge and left side of the temperature gauge work. I have tried swapping around bulbs between tachometer and speedometer to no avail.
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Is there battery voltage at the coils ? Test with volt meter Two wires at coils 1 battery voltage the other ECM control . does you vehicle have a tachometer , if so does it move when cranking over the engine ? If not possible crank sensor. Any lights lit on dash , SECURITY ?
It could be the low oil pressure warning light. That light looks like an oil can with one drip of oil on the tip. If that is the light it is telling you the oil pressure in the engine is low. You might want to check with a dealer to make sure if you don't have an owners manual.
Thanks for choosing FixYa and welcome. Have you checked your tail lamp fuse and cluster fuse yet? If not, check them. You could have an electrical issue. You may have a bad wire or loose wire somewhere. In order to find out, you will need to test the wires in the harness with a voltage meter to find which wires don't have current.
I can't speak for the engine light issue, but look into stepper motors for your gauges for the oil pressure issue. I just purchased a used '04 Trailblazer EXT and the tachometer stopped working 1 week after driving it off the lot. I did some looking and apparently the Delphi motors that GM used do not hold up. "Check this link for more info... http://forums.trailvoy.com/showthread.php?t=48886
replace oil filter bypass (the boss that the oil filter screws to)... other than that ..oil pump failing...main bearings out of spec not allowing oil to stay under pressure and reach the upper valve train...good luck