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Inop fuel gauge

Electrical and Electronic

Model: 964, Year:1990, Mileage:74500, Type of use:Street use only
My fuel gauge on my 1990 C2 Cab suddenly stopped working and doesnt move off the peg, and the fuel warning light is on, despite a nearly fully tank. I have done hours of research, but can find no data that tells me what the signals, voltages, or resistance measurements should be, so that I can determine where the fault lies. The sender reads 15 ohms, and I have power going to the gauge and to the VDO "conditioner" at the fuel tank. I read no DC voltage at the sender on either wire. Do you know what voltage I should be reading at the sender, and what the output voltage range from the conditioner should be? Thanks.

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