Hadn't noticed that, either. Presumably there's a bracket in the kit for the switch?
That took me to the MPC and I've discovered that this kit may not be for the F or U-series trucks. I say that because there are three kits listed, as shown below. The first kit specifically says it is Marchal and yet the instruction sheet is IS - 4844. But the instructions with the ebay kit, above, are 4852.
The second kit doesn't say what brand it is nor does it say what the instruction sheet's # is. It is possible it is this one.
The third one says it is the Blazer brand, so isn't it.
Not to say they won't work on our trucks, but they may not be perfectly "correct".
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI