AC cycle switch on pin 10 is a 12v+ input signal. I used the nitrous input for this. The wot relay needs a ground trigger, an unused inj output will do just fine. You will want to find the relay and swap pin 87a to 87. This way the MS3 can turn the compressor on instead of off, this is how i did mine.
I like to take the grounds to a common wire that travels back to the battery for the lowest ground offset value.
Okay I'm about to order the parts I'm missing to do these two relays.
Can someone basically triple check I have this diagram setup correctly to run the wideband only when the FP relay is triggered, then the ACCS relay triggers gorund to Flex In when 12v comes in on the stock harness pin 10 from the ccrm.
You don't need the diodes across the small relays because their coils are so small.
Instead of the fuel pump relay, you can use the EEC Power Relay, then you would only need one additional relay which can be a simple automotive 30 or 40 amp relay available everywhere, no need to order it.
No, the wideband should not be powered when the engine is not running. Unless you want to shorten the life of the sensor.
Do NOT wire it to come on with the ECU, if you need to have it wired to key power for testing install an empty fuse socket that can be used to jumper power to it.
I added a toggle switch from 85 to ground.
I keep forgetting this is a Microsquirt on a '95. You need both relays. You don't need the diodes. My MS has a 2N2222 driving the relay coil of the WOT relay. A 2N2222 will sink 1A, relay coil draws 1/3A.