There are a number of changes during the 98-99 years, so just double check. Even the seat belts changed slightly and I had to make a custom harness change for mine when I swapped in some newer 99 seats.
If I'm not mistaken, the pull knob switch is more likely to overheat than the turn style. Don't remember if the plug is the same, if they won't switch, just be sure to add a small hole in the vent line above the switch to allow the pull knob style to cool better....or upgrade to a Sport harness.
FYI, the 98 12 valve is a rare truck if it is a quad cab unit. I know a number of guys who would drool over one.....
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Kyle
USMC 2003-2009
"The only thing necessary for the triumph of evil is for good men to do nothing."
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