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I have a 2003 Yukon XL with the 8.1L engine. The oil pressure guage quit working (stays at 0 in all states at all times except for a small flicker on engine start). GMC replaced the gauge cluster under the SCA, but it still reads 0, so they diagnosed it as the sending unit. They want $300 to...

I have a 2003 Yukon XL with the 8.1L engine. The oil pressure guage quit working (stays at 0 in all states at all times). They replaced the guage cluster under the SCA, but it still reads 0, so they diagnosed it as the sending unit. They want $300 to replace it, but as I have been unemployed...