I used some 1 inch wide band steel from Lowe's and bent it into a horseshoe shape as to bolt onto the underside of the hood.
The steel is thick enough as to not bend due to wind or someone pulling on it. Three large sheet metal screws attach it. Be careful as to not use screws that are too long,as they will come up thru the hood.
Once th gauge was mounted,I used a rubber grommet between the hood and the bolts that held the gauge pod to the bracket.
The gauge I used was a 2 5/8 liquid filled Autometer Pro Comp. The pod was flat black.
I had to remove the drivers side windshield washer jet due to clearance.
Email me privately for pics if you want. My phone won't let me upload pics.
The bracket took time to fabricate inch by inch in a heavy vice.
I have since moved the gauge to where the stereo was where it sits next to the boost gauge. I just didn't like it sitting outside of the car due to someone possibly grabbing it at the local bar. Sometimes people can't keep their hands to themselves!