double checking does this look right(wiring)
Robert
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On the Trick RPM Window switch the yellow wire will go to one side of the FPSS, the other side of the FPSS will connect to the blue wire on The Interface (you will also set the Interface to be triggered off a ground). The Brown wire on The Interface will then connect to the N2O Relay, pin # 85.( the pic i posted in my org thread i did what i thought it ment )
The single stage uses a 12v trigger instead of a ground trigger. That is why I moved the FPSS to the brown as it is the ground control to the system relay. I have also requested information from HSW to help you but they have not replied yet. Hopefully they will chime in so we can get everything taken care of for you.
Hopefully it is as simple as getting the programming correct between the 2 units.


