Switched 12v source

RAVano said

If you tie the blue and brown together is there any harm with the power back feeding to the ingintion switch (IGN 2)? I'm about to wire up my car and wanted to know the safest, easiest most economical way of wiring a FI Tech. With a factory ignition sounds like diode/relays would be best bet. Does anyone have a wiring diagram of how to accomplish this? @Johnny Mac

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Your mention Factory ignition? The stock distributor and box need to be out of the equation. So just clarifying that. Pending year of vehicle you may have a 12v open slot on the fuse box. I havent heard of interference issues with the blue/brown method, but just my taste, I would much rather find a simple 12v source off a fuse spade, or even a switch under the dash. My 1974 had a random female butt connector coming off the fuse box. Perfect switched 12v.