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That seems like the best idea so far. How about a ACS712 bi-directional sensor. It is less than 3 bucks and can handle 2.1kV so it might also be worth looking into.
Either way it looks like a small board is going to be needed near the injector wire to make it work. So at least a 7805, capacitor, and voltage booster circuit to get the output to 5V when it is sensing current. Might not be that bad to build.
I will be ordering a bunch of stuff to build a battery balancing circuit for my car soon so I will probably get some stuff to try this out at the same time.
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