I don't know about the Spider but just had to swap out the ABS in My Slingshot
The ABS system in the Slingshot is a stock GM part and designed for 4 wheels
One port is capped off with a bleeder
It works thru its own portion of the ECU. I do not see any regulators but I an sure it is tied into the 3 wheel speed sensors
Thats I I got!
Good Luck
Hope you post the final project here
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I apologize for saying Spyder, I'm trying to find this information for any and all larger three wheel vehicles, Slingshot included, my brain just slipped.
Thank you for the insightful reply.
This is the most promising lead I've seen in some time: the pressure regulator is stock GM, with 3 ports in use. Cool. Is the ECU of the slingshot doing the control work or is there a separate box controlling that regulator and reading the 3 speed sensors?
Finding a regulator is not a big deal, but the control software is usually proprietary.