I've been looking for the same thing. I just found this on Jegs. It operates on egt's. They have another one which operates on a timer.
BD Performance Cool Down Timer - JEGS
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 1997 F250 HEAVY DUTY 7.3 L
* Tymar intake, 3" Down Pipe, 4" Exhaust (no kitty)* Post mount gauges * BD cool down timer * FPR shim * IDM mod * 4R100 trans * ITP Diesel HPX Line * Banks 1.00 (refurb) * DP Tuner *
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