If you don't have a voltage clamp for the MAP signal, or you would rather not use one (or the J&S MAP limiter), the VAFC could be wired up so that the ATTS gets the same signal from the VAFC that the ecu gets, similar to how JR has you wire up the JR "ems" in an SH.
Here is how JR has you wire the "ems" in an SH:
Here is how you would use the same technique when using the VAFC hack in an SH:
This
should work properly.
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