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I was talking about the#8 pin on the IG1 connector (plug and socket inline in the wire), Daox was talking about the I12 junction, which is nearby but I think actually is within the wire loom. Either way, it's the same single wire.
10 amps should be enough. I am running a 10 amp relay because it was cheaper than the standard 30 or 40 amp auto relay. Looking online, it seems like most stock injectors are "high impedence", around 12 or more ohms, so 1 amp - so I would be comfortable with 3 amp rated switches. I looked at Autozone and found even less good switches - just large toggle switches and a few momentary-on switches. Nothing at all was normally closed.
The microswitch I got at Radio Shack in a 4-pack (I possibly plan on using the other three to place dash buttons for my MPGuino, which is far back on the dash). The size of the little box is 6mm x 6mm x 4mm, with a button that is 6mm high and 3mm diameter. There are 4 little legs on the bottom, each about 2mm long. If you get something similar, make sure to check with a multimeter which pairs are connected and which are open - it was not the way I expected. It looks like of like a squashed animal (legs out to the side) so I guessed that it was either two switches, left to right, or two contacts for one switch, left to right. It ended up being two contacts for one switch that connected front legs to back legs.
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