Lights not working (1965 B40F)

[Phil C]

New ammeter fitted. Lights now all working okay. Very pleasing. Thanks again everyone.

As advised by Julian, I fitted the old O ring off my carb onto the new ammeter, under the bezel (even though there wasn't one there when I removed the old ammeter.)  Do people also use any silicone sealant or anything like that, or is that not necessary if an O ring is fitted?   

Phil.

[A10 JWO]

The O Ring should protect it.