[ngoma]

RedArrow, his car has a different front temp. sensor than what you are used to. Two-wire, like what the gassers have.

jpliddy, that sensor you see in your coolant overflow tank is not a temp sensor, it is a coolant level sensor (float sensor), a very desirable addition that would be well worthwhile wiring up to a warning lamp/buzzer on the instrument panel. It would tell you immediately when the engine has lost coolant, giving you a chance to pull over and assess the situation before overheat damages can happen.

That way you also wouldn't have to be constantly checking the coolant level.

Since you are a carpenter not an engineer, maybe you can do a trade with one of your clients who has skills to wire the sensor to a warning buzzer/lamp?