Hey everyone,

I ordered a new tach amp replacement from MB Electronic Upgrades (mbelectronicupgrades. com), thinking my tach amp was bad. The upgraded tach amp he designed is pretty cool -- it has a tiny LED that flashes every revolution to indicate it's getting a signal from the sensor. It also has a "self test" that makes the tach go slowly all the way up to 6 or so, then back to zero, when you first turn the key on.

So, I was able to determine that my tach works fine, but the sensor doesn't. I determined this by moving the wire that goes from the tach amp to the flywheel where the sensor is mounted. When I lifted the wire, the red LED started flashing, but when I let go, the connection broke and the LED stopped blinking. So, I'm pretty sure there is a cracked wire or broken connection. The wire is very brittle down there.

The problem is that I can't figure out how to get access to it to remove it. There is a small bolt but no place for a tool. I got under the car (without a lift) and tried to peer in...no luck for someone like me without a huge selection of tools, if that's even possible.

Does anyone know the best procedure for removing this sensor? I hope it doesn't involve disassembling things, removing belts, etc. It might not be worth all that...Any thoughts or ideas would be appreciated.

Thanks!

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1980 300SD (daily driver), 1981 300D (Inca Red)