Has anyone noticed RPM gauge issue in some cars (DB3S, D-type, 500 Mondial Pinin Farina Coupe)

[SpiderDemon]

I see the RPM gauge needle jerking in some cars, like:

Aston Martin DB3S '53


Jaguar D-type '54


and Ferrari 500 Mondial Pinin Farina Coupe '54 (no video attached).

It seems that the needle of the instrument works at a low refresh rate.
Has anyone else noticed this problem?
Maybe the issue is present on other cars as well.

 

[TumeK5]

This is actually not an issue. On the contrary, it's perfectly realistic. These gauges are known as chronometric, which are supposed to be "laggy". I actually brought up the same topic a while back, not knowing these primitive tachometers existed.

 

[sparkytooth]

That's a deliberate detail made to recreate a chronometric tachometer, as was common on old racecars.

 

[SpiderDemon]

Apologies for mistaking this for an issue! The nice thing here is precisely the ability to learn something new!

 

[JeyM]

It's because it's a chronometric tachometer

The RPM are updated every second or so, many old cars use that, and also more recent one, like the R30 Silhouette.

 

[sparkytooth]

Apologies for mistaking this for an issue! The nice thing here is precisely the ability to learn something new!

I didn't know either until GT7 came out and people pointed it out.

 

[XSquareStickIt]

The attention to detail in these cars is utterly insane...

 

[VinylRichie]

What I’m just wondering is, why did some manufacturers choose those over the other „normal“ ones? Because other cars from the same year ain’t got these. Did they had any advantage back then?

 

[Mert160]

I think the 917k is like that as well.

 

[Bendough]

I think the 917k is like that as well.

So is the Alpine A220

 

[Marcus Garvey]

What I’m just wondering is, why did some manufacturers choose those over the other „normal“ ones? Because other cars from the same year ain’t got these. Did they had any advantage back then?

In race cars with lots of vibration in particular, a chronometric tachometer is more stable to read. The needle doesn't bounce around. It also isn't as important for real time rev counting when you aren't trying to time a shift just before the fuel cut, so older cars where the upper rev limit was dictated more by valve float and otherwise just running out of huff it wasn't an issue.

 

[VinylRichie]

In race cars with lots of vibration in particular, a chronometric tachometer is more stable to read. The needle doesn't bounce around. It also isn't as important for real time rev counting when you aren't trying to time a shift just before the fuel cut, so older cars where the upper rev limit was dictated more by valve float and otherwise just running out of huff it wasn't an issue.

Thank you very much, that was very informative!