Which linkage.
The reverse lights are not adjustable.
Yes
There wasn't a 1998 Dodge Ram 1500 diesel.
No.
No, the 1994 has a hydraulic governer. The 1998 has a electrical governer.
No.No.
Linkage adjust
yes a 15 inch wheel WILL FIT a 1998 dodge ram 1500
Yes they will bolt up.
It is not adjustable.
No!
A 1998 Dodge Ram does not have EGR.