This might not be the time or place for this, but it is kind of along the same lines. :redface:
I have a 91 and the ABS started that squeal that you hear about during the "self test" after I first set out. So I installed an ABS pump from a late model integra. I made a wiring harness to make it plug and play and it worked great. No ABS lights, TCS lights or squeals. It still engages, but I noticed that the back locks up even though I used the '02+ NSX rear proportioning valve. I researched the Wilwood proportioning valves, but was having a hard time finding the adapting fittings. I guess my point to this is that it solved the weight issue (as the teg pump is considerably smaller and lighter), it was a cheaper solution than the SOS '02+ conversion, and still utilized the factory (91) NSX ABS computer without throwing lights. I have also tried installing other, cheaper honda ABS pumps with traction control signals integrated in the pump, but was concerned that the 4 wires coming from the NSX ABS computer (labeled as TCS) might require a different signal than what the wheel speed sensors put out. I would love to know if anyone knows what the 4 wires (labeled as TCS in the service manual ABS computer wiring diagram) require as a signal. I was assuming that they are a direct signal from the wheel sensors OR are a converted signal from the wheel sensors. They cannot be anything else because the wheel speed sensors do not communicate to the TCS through any other means.
This could be relevant to the OP and other Primers in the same boat because the newer pumps have a faster modulation rate and are lighter and cheaper.
Sorry for the novel, its just that I have been working on trying to bring this to the NSX community as an alternative option to the SOS kit as it is now ridiculously expensive now. OP, if I can get these two bugs worked out, this would be a feasible option for you to improve what you have without having to eliminate a valuable asset in your X.
Thanks,
Jay