Homebrewed Electricity > Controls

Firing an injector? How?

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nothing to lose:
I get alot of ideas and can figure out alot of things sometimes, this one puzzles me a bit. Probably a very simple answer!
How would I fire an injector/s on a engine that does not have injectors to begin with?

 I have thought of a couple ways, but won't work for various reasons. High speed gas engine so I dought a magnet and reed switch or similar type would work do to float.
An electric feul pump can feed the injector fine, 12V will fire the injector fine I beleave. So how would I trigger 12V at high speeds easily at a specific time?
Thought about getting one of those fancy inductive timming lights that flash on the #1 plug and connect to the battery for the 12V input. Problem, I probably want the injector to fire before the plug does for a single piston engine, and I don't want to try using 6 of those for a V6 either :(
Any suggestions? Thinking about tapping into the wire to the distributor or coil for the V6 or V8 engines. But of course I don't want to kill the ignition system doing it either.
I have some thoughts, but I am sure there are better ideas out there for fast cheap and easy and reliable that I am over looking.
Thanks

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