I was thinking something similar, but was going to use a fan thermostat switch on the trans so it would go on as needed. Then add a manual on/off overide to that. That way the common case of operation is automatic when the temp hits the trip point. In my case the 930 box does not need to have an oil pump running under normal driving, but for racing, hard driving it was told to me that it is a good idea. I would not make it more complicated then it needs to, IMHO simpler is usually better. I do like the idea of a central warning light that indicated a problem (Check Gauges Light like some cars have now). On my 930 the oil inlet to the pump comes out of the bottom of the case, so if a line break, not much can be done. And I think the ensuing fire and loss of control will be a good indication of a problem
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What size/type coolers are you folks looking at running? I was looking at one of the small fluidyne coolers (P/N DB30217) or one of the larger oil coolers in 2 pass form and mount it so fittings are up and hopefully the oil stays in the cooler when the pump is off (P/N DB30517).
Sandy