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Two sending units, one gauge with a switch to go between the two senders. Run one sender on the line going into the trans, and one on the line coming out. Then you can switch back and forth and see how well your cooler is actually working.
I ran mine to a test port on the side in the last rig. It was a bad idea, as it reads a lot higher than the actual fluid flow. I had it in mind to change to the dual sender, but sold it before I got to it.
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