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Jim - I have one of those cheap 'n nasty little indoor/outdoor LCD-display thermometers that you find hanging on a card in the Wal-Mart 'useless car trinkets' aisle. The wire is about ten ft long so I can hang the sensor in the airbox. On the 240's there is a rubber plug in the top which I remove, hang the sensor, then replace. Run the wires along the fender and up through the hood/fender crack and into the car. The door weatherstrip won't crush them.
The heat response after a cold start is pretty quick - comes from the exhaust manifold, after all. It overshoots to about 24C in a few minutes, and eventually settles to about 13C-17C in our 0C mornings. It depends on throttle opening - when you lean on it to climb a hill, the temp goes up about 5C. So it seems to work OK. This is ONE of the two I got from FCP 18 months ago. The one in the 81 has already failed - temp goes to 35C-40C (95-105F) and stays there. As the car is a K-jet and it's cold here (just S. of the Oregon border) right now, I don't think it will hurt, but I'll change it before Spring.
On our 940 I just put the sensor in the airbox, and closed it up. The lid pinches the wire, but no sign of problems. The 940's stat is probably OE and is (touch wood) still working OK.
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Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)
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