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Old 03-28-2010, 01:47 AM
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1985 300TD Tach Problems 722.416 trans

Is the tachometer for a 1985 300 TD controlled by the "tachometer amplifier" that I have read about? I think it isn't, I think by 1985 there is a different way of the tach working. Can someone please tell me -- Maybe it's something I can clean or plug in or something. My tach works occasionally. I would really like it to work more often.

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Old 03-29-2010, 01:50 AM
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No hints from anyone?
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Old 03-29-2010, 04:17 AM
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You're right, there is no tach amp. Do a search on the ovp relay.
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Old 03-29-2010, 03:04 PM
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The tach sensor on the 1984 and 1985 vehicles is on the rear of the engine, down under the oil filter. It reads revs off the front of the flywheel/flex plate. Signal goes to a box under the dashboard where it is conditioned and used by such things as the A/C et. al. The output of the box (OVP or over-voltage protection relay) feeds a nice signal to the tach. X2 on aaa's advice - lots of data here on OVP and tach.

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