There is mno indication one was ever fitted.
If you have the information on the ignition module (Bendix 456439 S101900419A), it would be useful,
regards and seasonal wishes

No diagnostic module fitted

I have just purchased this '91 460GLE (1721 petrol, carb, no turbo) to replace my 340. It keeps cuting-out and dying. No stuttering or spluttering just stops working. The AA say the rotor-arm is shorting, but there is no scorch/arcing marks, but replacing is a temporary cure. Low-fuel warning seems ...