I had to do a blind install as well.
Here's what I did:
Power and ground I got from the stereo connector because it was easy. When I do a proper install I'll find power at the back of the cluster.
VCC drove me nuts. Although 'sig' was labelled at the back of the speedo, this wire didn't seem to work. I tried them all. In the end I learned that the cluster has to be connected for VCC to work.
Injector. Look under the hood for the correct injector wire colour. Plug into this wire at the ECU.
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