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Old 09-20-2013, 06:42 PM   #6 (permalink)
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Join Date: Jul 2013
Location: Dirty Jersey
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The New Focus - '07 Ford Focus ZX5
90 day: 32.44 mpg (US)
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Originally Posted by Occasionally6 View Post
A Saturn SL2 has a MAP sensor. Perhaps a voltmeter reading the output from that is an alternative to a mechanical gauge?

At its simplest, just read the 0-5V across the signal and earth. If you want to make it more sophisticated, use a voltage divider (resistor) circuit and a 200mV LCD screen to convert the reading into units meaningful to you.
Considering the way a vacuum gauge is used, I think I'd be better of using a gauge for easier visuals (needle moved a little vs. numbers bouncing slightly) just seems easier to have a dial and needle.

Stopped at PepBoys this afternoon to see what they have. Plenty of vac/boost gauges but I want a 270* sweep vac so that subtle changes are easier to see. Asked the counter guy who was super nice and looked up that they can get. He found a Sunpro gauge for $24.99 but when he rang me up it only cost $19.99 because that is what Advance Auto sells it for . So $20 and I'll have a vac gauge on Monday, I'm happy. Here's hoping it helps my driving technique...

2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014

Cost to Operate Spreadsheet for "The New Focus"

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