I don't know whether it will help, but I'll give a brief comment. My pyro is an Isspro. It has a red, a yellow, and two black wires. The two black seem to be for the light for the gauge. The red and the yellow come from the sensor itself. Mine is mounted in such a way that I can't tell what the red and yellow are connected to. If absolutely necessary I can pull the whole gauge mount and look harder. On the other hand, it's an Isspro, so may not be the same anyway.
As Heath advised, don't cut those red and yellow wires. The gauge and sender are calibrated for the specific wire length.