I tried to use the Unisyn flowmeter on my three Webers(on a stock 240z) and can't get it to register any flow even when I dial the disk all the way down. Is there a problem with getting enough flow to budge the indicator at idle, or is it a defective meter? I tried the meter on a vacuum cleaner. and it required very little suction to move the indicator, but that's no real test. I thought maybe there could be leakage around the air horns, so I took them off but the meter won't fit between the air cleaner studs. Thanks, Victor

though it should be able to register from the air horns