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I'll do a couple of quick voltage changes in the morning (shuteye time now) & see what happens. I'll try both the fuel gauge & the temp gauge but I'll put the scope on the temp gauge first just to be sure.
Re pump. The block is the muffler which has 13cc of oil in it. I believe the oil is the lubricant for the vanes as well. Don't quite know how it all works just yet to keep it so quiet. Being a vane pump, they are inherently quieter than any reciprocating type pump.
The pantyhose in the rubber hose trick will certainly work. Just don't stuff it in too hard otherwise there will be too much back pressure on the pump & you won't get full vacuum. I did find some pneumatic mufflers that would reduce noise output by about 30dB. In either case the muffler or the stocking will clog up with crap & reduce the flow to the point it will need replacing.
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