reel intrument dimensions

[ibennett]

Hi,

I am looking for the exact dimension of reel instruments for a GA cockpit.

I suppose they are all more or less the same dimension.

I would need the inside diamater of a instrument, a C172 alimeter for example

IF someone has a link or the dimension

Thanks

[Jylhami]

The real instruments are around 80mm in diameter.
I think there was an autocad drawing available at simkits web page about C172 panel.

BW:Mika