Between Omaha and Des Moines, 7 miles South of I80 | Here is the most likely area, for the truck manufacturer to install an oil pressure "switch" (sending unit) on a CAT 3406B engine. It is the main oil gallery(of that engine), under the turbo/exhaust manifold area.
Red circle are all oil ports, that may have a sender.
Edited by 4WD 11/24/2012 20:59
 (3406B block showing main oil gallery ports.jpg)
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 3406B block showing main oil gallery ports.jpg (37KB - 1736 downloads)
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low oil pressure light cat 3406b
