Can an electrical oil pressure gauge be retrofitted to a W123 gauge set? My mechanical gauge works now for oil pressure, but the the phrases "failure is a common occurance" and "sorry sir there's no W123 diesels in our junkyard" mix like oil and water.

I'd like to prepare for the scenerio where my gauge dies, leaks oil and I'm already prepared for this conversion.

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Java Developer/Linux SysAdmin

Current:
*1984 300D ~200K,1989 MR2 250K, 2012 Ford Fusion 4.5K (fiance's car to replace the uber-unsafe cavalier)
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Past: 1998 Chevy Cavalier ,2005 Saab 9-3 2.0T, 1996 Mazda Protege, 1974 Porsche 914 2.0, 1997 Land Rover Discovery 4.0L/5Speed, 1995 Jeep Wrangler

This to me is about the last failure to expect. Rather than a conversion just grab a cheap cluster at the wrecking yard of the same type while available and the oil feed if you wish and shelve them.

The electric oil pressure system is more likely to develop problems in my opinion. You are right in that at some point used parts may become far more scarce.

I'm hopefully going to make a trip to the partsyards near me to see if anything changed, but the last time I went a few months ago there weren't any W123's.

__________________
Java Developer/Linux SysAdmin

Current:
*1984 300D ~200K,1989 MR2 250K, 2012 Ford Fusion 4.5K (fiance's car to replace the uber-unsafe cavalier)
----------------------------------------------------------------------------------
Past: 1998 Chevy Cavalier ,2005 Saab 9-3 2.0T, 1996 Mazda Protege, 1974 Porsche 914 2.0, 1997 Land Rover Discovery 4.0L/5Speed, 1995 Jeep Wrangler