Haltech F9A - Manual (Page 23)

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The fuse block should be positioned so that it can be easily accessed in case of fuse failure.
Do not mount the fuse block where it could be exposed to water. Mount via the two screws
holes in the block. Ensure that vibration will not cause the screws to vibrate loose.
Connect the Fuse Block assembly to the Main Harness.
1.3.8. Electronic Control Unit (ECU)
The Haltech F9 is not designed to be waterproof. It is desirable that the ECU be given as
much protection from the environment as possible. It is recommended that the ECU be
mounted inside the passenger compartment, either on the firewall, under the dashboard or
under the passenger seat.
The ECU has four mounting holes that allow it to be mounted to most flat surfaces. In
extreme cases of vibration, the ECU should be mounted on rubber antivibration pads. When
mounting the ECU remember that the communications connector on the loom should remain
accessible for ease of programming.