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I was looking for a way to mount another gauge and came across this 3D printed part.

SMART W450 1998 - 2007 52mm Dash Gauge Pod Mount | eBay

1998 - 2007 SMART W450 52mm Dash Gauge Pod Mount. RISK OF LOSS We are not responsible for typographical or pricing errors. Typographical Policy Once an order is placed, all sale prices are final.

www.ebay.com

I was originally going to fit an 'digital (7/8" thick)' gauge where the clock is.
Digital for thinness and not having to plumb vac lines say for the boost controller.
But I like that clock and decided to try out this gauge pod.

The vent pod on the left side is obstructed by the steering wheel so it had to go on the right side.
This seller also lists some $60 fee in his auctions so I believe the same part could be made for 451s and 453s.

I may go with a digital 'OBD2' gauge in another 450 where I didn't double the boost...