23-06-20, 11:50 AM
(23-06-20, 08:17 AM)Gnasher link Wrote: [quote author=Grahamm link=topic=26274.msg316778#msg316778 date=1592854607]
I hooked them all up to #1 cylinder to check how much (if any) they were off from each other.
If you telling me that every gauge gave a different reading when hooked up to No1?
If that is the case and all the connections are good, the gauges are unusable. Sorry to say that but if they can't all read within about 0.1Hg of each other on the same cylinder, you've got no chance unless you can calibrate them within 0.1Hg.[/quote]
If you look at my pictures, you'll see that I wrote down the differences between the readings.
So gauges #1 and #3 gave the same readings, but #2 was 0.75 down and #4 was +1 up.
As long as I remember to add or subtract as required, I can get an accurate result.
A mercury gauge is around £100 or there are digital ones for £400+ !