Volvo RWD 120-130 Forum

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Tach and MSD 5 box 120-130

uid 10468's pic
posted by  yogui on  Fri Apr 8 13:10 CST 2005
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last visit: Tue Apr 30 15:41 CST 2013
[RELATED]

Hi. Info for the next guy/lady putting a MSD 5 into his/her car:

Some time ago I put a MSD 5 ignition unit into my 121 (B18A engine). As expected, the car run great but the tachometer (a oem cheap unit) go dancing like a mad dog under 3000 rpm.

Last week I move the tach sensing wire from the coil (-) post to the distributor post (now I´ve a "Y", come from the distributor, one side goes to the white wire of the MSD 5, another to the tach).

It cures the tach dancing.

Happy volving
--
Joaquin / Rojo 121 / Lima, Peru








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Tach and MSD 5 box 120-130

posted by  Phil S. on  Fri Apr 8 13:39 CST 2005
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last visit: Fri Oct 24 13:18 CST 2014
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Yes, that's the exact good solution. Some tach manufacturers (Autometer, for one) consider the warranty void if you connect to the output of the MSD box. I don't see any problem connecting it to the input -- the signal that used to drive the coil and tach then drives the MSD box and tach, and it's still the same signal.







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