I have been thinking about using the Gasser Economy Gage for/as a Vacuum Gage.....it will be operating in a range that it was designed for......Economy=Manifold Vacuum.....I have wondered why MB did not do this, instead of manufacturing a different instrument cluster for Diesels??

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG

I finally got the needle off the shaft. I ended up using a fork and pulling it straight up with my thumb on the pointer head.

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A diesel doesn't operate at the same manifold pressures. With a diesel more Manifold vacuum = blocked air filter = poor economy.

Higher manifold pressures, to a point, give BETTER economy with a diesel.

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Ron Schroeder
'85 300 Turbo Diesel 2 tank WVO
'83 300 Turbo Diesel 2 tank WVO
Some former WVO vehicles since ~1980:
'83 Mercedes 240D
'80 Audi 4000D
'83 ISUZU Pup
'70 SAAB 99 with Kubota diesel
'76 Honda Civic with Kubota diesel
'86 Golf
Several diesel generators
All with 2 tank WVO conversion
LI NY