hotskillet,

The sensor is pretty easy to get to. You have to reach around the oil filter housing to get to the lone screw that holds it on. It is a black plastic housing about 1" long and 1/2" wide with a wire coming out of one end. The other end of the wire hooks to a connector inside the first firewall. If you haven't tried to run your air conditioner with the tach dead you probably haven't noticed that the A/C compressor clutch will not engage when the tach isn't working. This was my main reason for fixing the tach. It can get pretty hot in Kansas without A/C.

Bill

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Current Vehicles:
1990 Mercedes 300SE (147,000)
1985 Mercedes 300SD (203,000)
1983 Mercedes 240D (167,000)