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Old 11-07-2012, 10:25 AM
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1995i540 1995i540 is offline
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Location: New York
Join Date: Apr 2007
Posts: 837
Mein Auto: 1995 540I/6
1. Instrument clusters (temp readings) are slow and I would say not very reliable due to lag.

2. In 540I as I can recall you have a switch sensor and coolant sensor in rear and in radiator. All 3 sensors are exposed to coolant.

3. This is pretty simple, take a coolant sensor and splice the wires, all coolant sensors have Ohm spec that represents temperature state once it reaches certain Ohm you can sound the buzzer. I would avoid doing anything directly with cluster because of lag problems.

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