Mystery dial

I have a French aircraft from the 60's and cannot identify one of the dials.
It is calibrated from 0 to 30 and when the engine is on seems to stay
between 12 and 15 no matter what throttle setting. Its only other marking
is Pz.

The panel has all of the other expected gauges including oil pressure and
temp and EGT

Can anyone shine any light on what this dial/guage is for?

Andy

"Andy Fogg" <benito@pussilini.freeserve.co.uk> wrote in message
news:bmjlf8$a51$1@newsg4.svr.pol.co.uk...
> I have a French aircraft from the 60's and cannot identify one of the
dials.
> It is calibrated from 0 to 30 and when the engine is on seems to stay
> between 12 and 15 no matter what throttle setting. Its only other marking
> is Pz.
>
> The panel has all of the other expected gauges including oil pressure and
> temp and EGT
>
> Can anyone shine any light on what this dial/guage is for?
>
> Andy
>
>

Does it have any vacuum driven instruments? If so possibly a suction gauge.
Apart from that, Volts/Amps, or some other pressure reading.
Chris

"Andy Fogg" <benito@pussilini.freeserve.co.uk> wrote in message
news:bmjlf8$a51$1@newsg4.svr.pol.co.uk...
> I have a French aircraft from the 60's and cannot identify one of the
dials.
> It is calibrated from 0 to 30 and when the engine is on seems to stay
> between 12 and 15 no matter what throttle setting. Its only other marking
> is Pz.
>
> The panel has all of the other expected gauges including oil pressure and
> temp and EGT
>
> Can anyone shine any light on what this dial/guage is for?
>
> Andy
>
'could be a dodgy MAP gauge - does it show about 29 with the engine off?

Dave S

Its a bad-breath garlic gauge - it samples the air, checks for garlic fumes
and won't let you fly if you're over the legal garlic limit.

Rob
"Andy Fogg" <benito@pussilini.freeserve.co.uk> wrote in message
news:bmjlf8$a51$1@newsg4.svr.pol.co.uk...
> I have a French aircraft from the 60's and cannot identify one of the
dials.
> It is calibrated from 0 to 30 and when the engine is on seems to stay
> between 12 and 15 no matter what throttle setting. Its only other marking
> is Pz.
>
> The panel has all of the other expected gauges including oil pressure and
> temp and EGT
>
> Can anyone shine any light on what this dial/guage is for?
>
> Andy
>
>

Rob White wrote:
> Its a bad-breath garlic gauge - it samples the air, checks for garlic fumes
> and won't let you fly if you're over the legal garlic limit.
>

Uncorrect : it won't let you fly if you're below the legal garlic limit.

Andy Fogg wrote:

> I have a French aircraft from the 60's
What type, please ?