Okay here is my update on the clutch switch. I average 38-39 mpg on most LD runs with the switch jumpered. I purchased a new switch and my mileage went to an average of 43-44 mpg. I haven't seen the wiring diagram so I can't talk to the idea or notion that it controls timing or injectors but I can tell you that the $12 switch bumped my mileage a lot. Wardie
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