Engine bay temps, Anyone measured them? Options

[lapuwali]

Wondering if anyone's tried to measure the engine bay temps, specifically down near the ECU, or over by the relay board.

I'm in the planning stages of a Megasquirt retrofit, and I'd like to mount the whole thing in the engine bay, rather than run a LOT of wires through the firewall. If the temperatures aren't too high (above 125dC, or about 250dF), then all I need is a waterproof enclosure and waterproof connectors in and out of that enclosure. Those are available (though they're expensive, and not part of the usual MS setup). If this works, I'll only have to run three new wires through the firewall for the serial programming connection (using the MegaView unit), rather than 14 to hook up to an MS mounted in the cabin.

I'm pretty confident it's cool enough, as 125dC is bloody hot, but if anyone has any actual data, that would be useful. If it's normally below 80dC (180dF), then even cheaper lower-grade parts can be used.