It looks like relay pins 85 and 86 are the coil. This would mean that the yellow wire on the window switch unit goes to ground (energizing the relay) when the WS unit is powered up via the red wire.
Appears that relay pin 30 is the switch common with pin 87 being the NO contact and 87a the NC contact. This would kill the TPS signal to the ZEX if fuel pressure is too low.
If I got all that right, the white wire on the ZEX should be connected to TPS. Doing so will do away with the low fuel pressure cut-out.
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