These can be added to our Diesel Fuel Boost Pump Kit or can be installed separately.
The new switch fits perfectly into the hole already drilled and all you need to do is tighten it down. The relay slides onto the side of the other relay and locks in place. It is not necessary to attach it with another screw.
Fused Relay and Toggle Switch Combo
$18.95
SKU:
ELT-RELAYSWITCH 
Product Details
Related Products:
$149.00
1977 to 1995 Universal Diesel Performance Fuel Boost Pump Kit
8/14/25 Revision. The deluxe kit comes with one switch and one relay for the fuel boost pump, but is pre-drilled to add a second if you want to power a second component. Additional fused relay/switches can be purchased separately below.
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.