LED check engine light w a GM ECM/harness?

[TomM]

Never heard of that. The only issue I have heard of is LED not working because polarity is wrong, as some don't come marked. I have used nothing but LED's and never set a code for them.....

Detroit Speed makes some really nice ones, very small and very bright. You almost cannot see them in your dash.

T,

[Ron in SoCal]

Thanks Tom. I am using an E38 ECM and DSE LEDs

I'm off to the shop and will report back.