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Hi, Geoff1946. I really like both of your suggestions in your latest post, so will be utilising each one. I have a couple of "reasonable" multimeters, so can measure resistance of the ammeter and should be able to play around and make an appropriate shunt using the 2.5mm cross section wire you...

Hi Geoff1946 and thanks again for your time. Both leads from the ammeter eventually end up in the engine compartment - one going directly to the  "A" terminal on the voltage regulator, the other going via the isolating Switchbox in dash to the main fuse panel (also in engine compartment...

Hi Geoff1946 and thanks for your reply. Re my preference for something besides a shunt, I believe that a shunt has to be fitted externally on the back of the ammeter, so it's totally exposed and live . The dashboard on this car is timber on a steel frame and the wood surrounds the 4-in-1 gauge...

I'm an old ex-motor mechanic with basic auto elec experience. Have an old Bentley Mark VI (1947) and have fitted a one-wire, neg earth alternator conversion (which retains the external appearance of the original dynamo); the alternator puts out 40 amps. At the same time I replaced virtually all...