Haldex Purest Air Dryer install on M35A2 - questions about wiring, etc

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So I have a Haldex N50011H, which I believe is original equipment for MRAP and perhaps M939 series trucks.
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I'll be installing this on my '87 M35A2C.

After reading up on various threads (https://www.steelsoldiers.com/threads/air-dryer-for-an-m35a2.65682/), I have questions:

A. I looked all over the web and don't see a Haldex wiring connector out there. I'd like to build a jumper harness to get power to the heater. Are they out there? Image of my connector below.
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B. Does the heater on this dryer cycle thermostatically on it's own, or do I need to put a thermostatic relay in line? I see people here on SS saying if the heater is on all the time, it'll burn up quickly.

C, Jeepsinker did an excellent video on installation of a Haldex Purest on his A2 on his YouTube channel and he added a pressure relief valve. My unit has what looks like a pressure relief valve already on it. Is that what I'm seeing and if so, I assume that means I don't need a pressure relief valve plumbed in?
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Much thanks
 
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