On 4/16/2015, Stephen Holt wrote:
A bit of information from PerTronix in regards to electronic distributors and MGB Tacho’s. I installed a D1766 distributor I purchased from a local MG spares stockist (here in Sydney, Aust.) and I started almost immediately to have trouble with the Tacho. It was all over the place, it would read

Zero Correct RPM Swing Full scale.

I noted from your pages that people had had similar problems so I contacted them direct and here is there answer.

"If you have a Smith tach you must remove the loop from the back of the tach and it should fix your problem. See attachment". -- Carl Alcocer, Technical Support, PerTronix Inc., 909-273-6007 carl@pertronix.com
    Attachment: smiths_tachs.pdf