Unless you wired the new clutch switch into the brake switch harness, then that's a non-issue.
The starter circuit will be completed and the car will "turn over" if you do nothing other than splice the 2 big wires behind the fuse box - The top plug.
The ECU will not prevent the car from *trying* to start.
You've either got:
-- A dead/dying battery (not enough juice to turn it over)
-- A corroded battery connection (can supply 12v to accessories and such, but not the amperage needed to turn the starter)
-- OR you didn't splice the correct plug (??)
- Brian
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