Testing gauges with new voltage limiter
You don't need a diagram, just look at the rear of the cluster. Can you post a photo of the cluster, a CLEAR photo?
Go by the harness wire colors to identify sensor wires and "key" power coming into the cluster
There are three terminals to your fuel gauge.
1....one goes to the fuel gauge sender pin on the PC board. ID this by harness wire color
2.....One is power coming into the old IVR from the key. That also you should ID by color
3....The third pin is the IVR output which jumpers to the other two gauge power studs. That should be easy to follow
If "you don't think it's wired correctly" you better figure out how to check because you may be burning up some hard to find gauges......................