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So it wasn't the coil... can I be sure its the Hall Sensor? 700

If the failure causes the tach to drop to nothing, it's the hall sensor. you need a new distributor!
The coil is the last piece in the system- a bad coil won't cause the tach to drop.
Chances are the hall sensor plug is all burnt up at the bottom of the dist. The wires inside it short out against the body of the distributor.
I had to put a new dist in our 88 745 at about 200K miles 2 years ago.

Not a hard job really. Expensive part though. Good luck!
--
Rob Bareiss, New London CT ::: '87 244DL/M47- 230K, 88 744GLE- 220K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 94 855GLT 189K






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