This is the set Kent uses and recommends. A heat gun will be required.
Wire strippers and crimpers have come a long way in 20 years. There are a number of good options available, but this is the pair Kent recommends when working with shrink-style wiring connectors. PLEASE NOTE: Colors may vary depending on the stock available, but he functions and quality will be the same.
Wire Stripper and Criming Tool for Heat Shrink Wire Connectors
$39.95
SKU:
TUL-STRIPPERCRIMER 
Product Details
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$125.00
Currently out of stock.
1977 to 1995 Universal Diesel Performance Fuel Boost Pump Kit
8/22/25 Revision. Now, it's a complete DIY assembly kit with all the parts you will need and two lengthy video instructions.
This can be installed in your W116 W123 W126 W201 W124 diesel in 60 to 90 minutes. You will use the video instructions for installing it in a W123 (included), then you will make location modifications to fit your specific chassis.