I still don't understand how the diesel tach did not work for you. Mine is wired with 1 side of the hall effect switch to ground, and the other side on my gas tach wire, and the instrument cluster was just installed... the wiring was exactly the same.
-------------------- 87 Raider 4.3 700R4 NP231CHD
Solid Axles, Selectable Lockers, 36's
87 Raider 4D56td v5MT1
Almost all stock.
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