Says 71c but the gauge says 45... Is there a way to test the temp sender without using the infrared gun? I couldn't get an accurate reading yesterday with it.

My temps prior to installing the new temp sender would rise pretty quickly to 90c. I would say like 10mins. Now in 10 mins it barely hit 50c.

Can anyone tell me which temps are closer to realistic?

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1984 300td euro turbo