Will 1/8" 3mm inner Diameter silicone vacuum hose work to replace the plastic line supplied?

Yes, 1/8" 3mm inner diameter silicone vacuum hose should work with no issues with this gauge.

Does anyone know the drill bit size for the fitting, so I can drill the hole and get it ready?

The fitting comes separate in the box, its not attached to the vacuum line. Vacuum line is 1/8". If your drilling through firewall, get a 1/4" grommet, drill 1/4" hole, press grommet into hole, run vacuum line through grommet. The fitting comes with a sleeve that slides over the hose then fitting goes over sleeve, then tighten fitting to vacuum input on back of gauge. Once you get the gauge, the instructions are pretty straight forward as far as installation goes. Hope this helps. Good luck on your install!

Will the fittings supplied, thread into one of the 2 plugged holes in the top of the intake plenum of a GM '93 6.5 turbo diesel

1. The Bosch SP0F000050 Style Line Mechanical Boost Gauge Kit includes (1) adapter to connect the Kit’s nylon tubing to a 1/8 NPT hole, and (1) adapter to convert a 1/4 NPT hole to a female 1/8 NPT thread. If larger sizes of NPT pipe thread adapters are required they can be obtained at an auto parts or home improvement store.2. If the holes in the plenum have metric threads, Bosch offers the SP0F000009 Metric Adapter Kit. This Kit has adapters to convert M10, M12, M14, and M16 metric threaded holes to a female 1/8 NPT thread, to fit the adapter in the SP0F000050 Boost Gauge Kit.

What color is the backlighting?

Comes with just a regular colored bulb. White with a slight yellow hue. Careful with the vacumm tubing it comes with. It's kinda brittle.

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Bosch SP0F000050 Style Line 2" Mechanical Vacuum/Boost Gauge (Black Dial Face, Black Bezel)

Product ID: 315572856

Details

Brand
BOSCH
Item dimensions L x W x H
19.8 x 11.4 x
Item weight
9 g
Material
Plastic Steel
Number of Items
1

🔌12V internal backlighting included

🖤2" black dial with sleek bezel

⏱️270° sweep for precise readings

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Description

🖤 Elevate your ride’s precision and style with Bosch’s iconic vacuum/boost gauge!

PLUG PLAY READY - Comes complete with 72" tubing, fittings, and mounting hardware for effortless installation.
PRECISION AT A GLANCE - 270-degree sweep ensures ultra-clear vacuum and boost readings for flawless engine monitoring.
NIGHT READY VISIBILITY - 12-volt internal backlighting guarantees readability during late-night drives or low-light conditions.
TRUSTED BOSCH ENGINEERING - Backed by over a century of innovation, delivering reliability and style in one compact gauge.
SLEEK PROFESSIONAL DESIGN - Classic 2" black dial with matching bezel fits seamlessly into any dashboard setup.

The Bosch SP0F000050 Style Line 2" Mechanical Vacuum/Boost Gauge combines precision engineering with sleek design, featuring a 270° sweep for accurate vacuum (0-30 in. Hg) and boost (0-20 PSI) readings. Designed for standard 2-1/16" openings, it includes 72" tubing, fittings, mounting hardware, and 12V internal backlighting for optimal visibility. Trusted Bosch quality ensures reliable performance and a professional look for automotive enthusiasts and managers who demand both function and style.

Specifications

ASIN	B00UM9X2HW
Best Sellers Rank	#86,154 in Automotive ( See Top 100 in Automotive ) #6 in Automotive Boost Instruments
Brand Name	BOSCH
Country Of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (465)
Global Trade Identification Number	00028851027281
Included Components	Gauge
Item Dimensions	19.8 x 11.4 x 8.9 centimeters
Item Weight	9 g
Manufacturer	Bosch
Material Type	Plastic Stainless Steel
Model	SP0F000050
Part Number	SP0F000050
UPC	028851027281

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