I looked thru all the drawing I could find here and outside, but still don't know what purpose these serve. the two switches have small wheels on the ends. The white plastic ramp block has a groove worn in it from the small wheel being seized up. It's worn flat a third of the way thru. Do these affect the way the engine performs, or the trans?? I know the kickdown is behind the accelerator pedal, so what could these be for? Anybody know? Thanks

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1990 300D 2.5
1991 F350 7.3 Dually IDI

1997 F350 gasser dump
1980 H-D 93 inch Shovel
2000 SE Roadglide

Sorry, forgot. 1990 300D Switches to the left of the throttle cable

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1990 300D 2.5
1991 F350 7.3 Dually IDI

1997 F350 gasser dump
1980 H-D 93 inch Shovel
2000 SE Roadglide

They are for the EGR.