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Old 02-06-2022, 02:40 AM
Alec300SD Alec300SD is offline
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Join Date: Nov 2013
Location: San Mateo, CA
Posts: 1,108
Boost gauge was not a factory optiion AKAIK.
The MityVac setup works well to verify boost on a short term basis.

To monitor boost, I have a Autometer 5904 mechanical boost gauge plumbed in 'Desert Rose'.
The gauge range is 0 to 35 psi, black background with white numbers, illuminated, with a red (not orange) almost factory look.

For the boost feed to the gauge, an ALDA banjo bolt (with a barbed fitting) from an '85 OM617A was used in place of the stock '78 ALDA banjo bolt.
Thick walled silicone vacuum hose was used to connect the gauge to the barbed fitting on the ALDA banjo bolt.
78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022
91 W126 300SE 'Kjetteri' new as of 02/19/2022
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