I'll answer what I know...
What/where is the ECU B136 connector?
You need to find a pinout of the ECU harnesses, that will show which connector is B136.
Where are some good places to mount the siren?
Under the hood, somewhere that it can't be seen or reached easily, especially from under the car.
Where are some good places to mount the brain?
Hide it well somewhere inside, behind the glove box or gauge cluster or maybe behind the radio if there's room.
What/where is the combo switch?
The combo switch typically refers to the stalk with your headlight and turn signal switches.
And, when I multimetered the constant 12v, I noticed, it is only 12v when the ignition is in the on position. Is this correct?
Constant 12v should be just that, always reading 12v with the key on or off.
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