Dual manifold vacuum gauge

Nicholas

They work great but you have to look for them.  Found one listed on Ebay, it is a bit pricey however.  If you go to the aircraft flea markets at airshows they normally have a few.  I have seen them at much lower costs in Oshkosh or Sun n Fun for example.  

Cheers

My carb vacuum gauges are cheap dial (Bourdon tube) types from a motorcycle shop - they work very well.

Try eBay ($40 Australian)

Had to purchase sufficient length of vacuum hose/tube, so gauges can be temporarily mounted in cockpit but otherwise use as is.

Dials can be zeroed.

I always swap vacuum hose to check for gauge error - has never been a problem.

Not sure why you want rpm - its will be the same for each side ie same as your instrument tacho.

It’s weird that there’s not much new market for them anymore. Thanks though 

Nicholas Wilcox wrote:

It’s weird that there’s not much new market for them anymore. Thanks though 

The digital world is taking over. ?

For the home mechanic, carby balancing is usually an infrequent task. Throwing more money at a fancy carb balance tester, won't make the job any easier or more accurate.