[Mgs] MGA with 5 main MGB engine

[Paul Hunt]

Which tach?  Where did it come from?

For an MGB tach 'yes' if it has RVI on the dial.  No if it has RVC, for 
that you need a wire back from the points side of the coil to the tach 
bullet connection.

Plus 12v and earth connections to the tach to power the electronics, and 
that raises further questions. Have you converted the car to positive 
earth? If not unless the tach is already negative earth (the _original_ 
polarity is also on the face of MGB tachs for example) you will need to 
reverse the power wires inside the tach case and also the signal wires, 
which can be inside the tach or outside depending on which tach you have.

PaulH.


On 30/07/2023 01:50, dave northrup wrote:
>
> I am trying to figure out how to connect the tach on this car.  it 
> came to me in kit form
>
> This diagram seems to show that in essence the connection from power 
> to the ignition coil goes through the tach.  That green wire goes off 
> to the gage voltage stabilizer – is that even needed?
>
> So it seems to me that on my car, which has an original early  MGA 
> wiring harness, all I really need to do is run the white wire through 
> the tach then to the ignition coil, instead of going straight to the 
> ignition coil.  Am I on the right tach here (haha)?
>
>
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