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Hey thats good news! What was the response like from when you adjusted the power supply until movement of the needle? I'm convinced there's a computer (micro) interface here that may ignore sudden changes. Not that big a deal for this fuel sender interface, but you'll want quick response on the temp gauge. Since temperatures change slowly, the micro may used a slow sample rate on this or large sample averaging. While you have the setup, you should connect to the temp wire and see what the gauge does.
I've seen that pump kit before. You'll notice on the left side of the pump a beige colored block. I believe this is the muffler which is the main reason for the 40dB level. The Thomas has none. I read a post the other day where it was recommended to make a muffler from 2ft of heater hose filled with pantyhose. Pantyhose woven into a metal coil made from coathanger inserted into said hose. Then attach to exhaust port. I might give that a go.
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