GM Alternate fuel service manuals

[PHXSYS at aol.com]

Hi

I just bought GM fuel injection gas mass sensors and butterfly valve for 
compressed natural gas trucks. I believe they were designed for GM 5.7L 
engines. I need to obtain wiring info for that application. I believe they 
were model year 96-99.

Does anyone have a source for GM manuals especially rare alternte fuel trucks.

Thanks in advance
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