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most look like a small jet engine
A small engine...it will be in the farthest left gauge.
Basically like a small muffler stuck closer to the engine.
usually a small black box on the firewall (back of engine compartment)
shaped like an engine
There are two small fuse boxes located at the rear of the engine compartment.Open the rear engine door and look to the lower right of the engine assembly. The two small covers,one above the other, held on with metal clips are the fuse boxes. The covers look somewhat like relays.
Looks like a small electrical motor usually located at the lower rear end of the engine
What does a engine scanner look like
like this
For a chevy engine look over at http://www.newchevyengine.com
just like a car engine but bigger
Depending on the year it may look like a little yellow engine, or it will say check engine, or service engine soon.