There is no reason to need 3 seperate relays for this set up. a single 12vdc, 3 pole relay will do the job perfectly. Route the circuts (wires) for each of the 3 pins - 25, 35, 37, through the Normally Closed (NC) contacts of the relay, and an external switch of your liking to the coil off of a "hot" ignition switched source, flip the switch - energize relay- break the 3 circuts and you'll have your "ASR Off Switch" with one relay - not three. A 12vdc 3 pole relay may be a little trickey to find but they are out there, usually a larger electronics distributor will have them. Good luck - and if any can verify exactly what pins 25, 35, 37 actually do and share that here it would be great...

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1980 FERRARI 308 GTSi
2002 MERCEDES BENZ C32 AMG
2004 TRIUMPH BONNEVILLE BLACK - CAFE RACER