1990 Nissan Skyline

Electrical problem
1990 Nissan Skyline 6 cyl Two Wheel Drive Manual 204000 miles

Hi I have a 1990 Nissan Skyline GTST type M with an RB20 motor in it. I recently had one of my coils in my injectors replaced and all of my o-rings done. Now that I have had them done I have a light that comes on in my dash at the bottom of my guages beside my RPM meter to the left of my door symbol. It looks like a Chevrolte symbol with little squggly lines above it, what does that light mean and what harm is it causing to my engine?
Thank you
April 21, 2010.

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