Hi Scott,
Good point - when you put it that way, I guess it isn't such a short induction system. I'll go back and really look hard for vacuum leaks. Thanks for the advice. 
Mike M

Sent from my iPad

> On Oct 27, 2014, at 13:20, "SDF ( aka ;jim lahey' - Scott )" <scottdaniel@TURBOVANS.COM> wrote:
> 
> Hi Michael ..
> I wouldn't say the induction system is 'that short' ....from throttle
> valve to intake valves is a nice distance.
> ( longer on the 'equivlant' subaru engine ..the runners curve up and
> then down , adding length, leading to two intake valves per cylinder ,
> and the injectors are a twin spray pattern ..each part aimed right at
> its intake valve - very nice .)
> 
> I would check into this on your engine though ..
> air leaks in the entire intake system ..
> I had one engine that was a little reluctant to rev out well ...
> could hear the 'air intake moan sound' just fine, but it acted like the
> needed fuel wasn't being added.
> 
> I found about 10 tiny vacuum leaks ...where the runners join the plenum ..
> also check where runners meet the cylinder heads ..listen with a
> listening tube..
> any hissing ...that's a leak.
> spray carb cleaner works too . .I think the listening method is a
> little better.
> 
> numerous tiny vacuum leaks could be a factor.
> now that I think about it more ..that T'd into the line from plenum to
> Fuel P. regulator ...that should work all right I'd think ..
> unless there is a leak on the way to your vac gauge ..
> or some kine ( Hawaiian lingo ) thing like that.
> 
>> On 10/26/2014 10:22 PM, Michael Magnani wrote:
>> Hey Scott and Dennis,
>> Thanks for the feedback. Since the induction system is so short, I'm curious where would be a better place to tap for vacuum?
>> Mike M
>> 
>> Sent from my iPad
>> 
>>> On Oct 27, 2014, at 0:28, "SDF ( aka ;jim lahey' - Scott )" <scottdaniel@TURBOVANS.COM> wrote:
>>> 
>>> two thoughts ..
>>> I'm not sure that's the best place to access engine vacuum for your gauge ..
>>> also ..
>>> I have never not found 2.1 exhaust valves to not be slightly burnt when
>>> taking the heads off for head gasket etc.
>>> 
>>> 
>>>> On 10/26/2014 1:58 PM, Michael Magnani wrote:
>>>> Hi all,
>>>> I just completed an installation of a voltmeter, oil pressure, oil temperature and a vacuum gauge in my stock, 1990, 2.1 WBX with 105,000 miles. No leaks, no smoke. Everything nice and as it should be - except for the vacuum gauge. At idle, instead of reading the expected 20 In. Hg, it reads about 13. When I rev it up and then let go of the throttle, the needle will get to 20, but then go down into the 13-15 In. Hg. range.  I've got the 1/8" vacuum tube Teed into the hose between the Air Plenum and the Fuel Pressure Regulator. I've tried two different vacuum gauges to verify that the dashboard gauge is reading properly.
>>>> I've verified the ignition timing at 35 degrees BTDC @ 3000 RPM with the temp sensors connected. The engine runs perfectly and makes as much power as it ever did. I'm confused. Can anyone offer any help?
>>>> Thanks,
>>>> Mike M
>>>> 
>>>> Sent from my iPad