Jim, thanks for the info. it will be helpful. I won't be doing this today as
originally planned,
it's raining here : - (. Presently the V8 is outside and the race car and the
A coupe are inside.
Guess I need more indoor parking!
Thanks again.
Larry Hoy
>-----Original Message-----
>From: owner-mgb-v8@autox.team.net [mailto:owner-mgb-v8@autox.team.net]On
>Behalf Of Jim Stuart
>Sent: Saturday, October 21, 2000 9:03 PM
>To: Larry Hoy
>Cc: MG V8 List
>Subject: Re: Tach conversion
>
>
>The white wires on your old tach create a loop inside the tach working as the
>very early
>models that
>had an external loop. These wire need to be joined as they create the feed
>from ignition
>to the plus
>side of the coil.
>
>A new wire must be run from the negative side of the coil to the male terminal
>on your new
>tach. The
>new tach needs power to the other insulated terminal. This can be the original
>2 green
>wires from the
>original tach.
>
>The remaining uninsulated terminal is case ground, to any convenient spot.
>
>Jim Stuart
>
>
>
>Larry Hoy wrote:
>
>> I have a question about the tach conversion using the 100k potentiometer
>(pot).
>>
>> My 1969 car came with the earlier style tach. Apparently this tach is not
>suited for the mods as
>> outlined in the MGB V8 newsletter, and Leon Zaks web site. I scrounged up
>another suitable tach
>> from my stash and made the mods.
>>
>> When I went to install my newly modified tach I found there is a wiring
>difference in
>the two tachs
>> and my car doesn't just "plug in" to the new tach.
>>
>> The old tach electrical connections consist of a:
>>
>> round female Lucas connector (had a white wire attached that goes to the
>coil)
>>
>> round male Lucas connector (had a white wire attached that goes to the ign
>switch)
>>
>> male 1/4" connector (had two green wires attached dunno where they go)
>>
>> The new tach has a:
>>
>> round female Lucas connector
>>
>> a square 1/4" male connector.
>>
>> male 1/4" connector on the case for ground.
>>
>> Notice there is one less connector.
>>
>> Can anyone help me with this dilemma? What wires go where?
>>
>> Larry Hoy
>> Still sorting out the odds 'n ends
>
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