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Old 03-31-2015, 09:56 PM   #1 (permalink)
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Circuit to translate MAP signal to boost gauge?

Anyone have a clue how I'd tap the MAP signal on my TDi to get a real time reading of manifold pressure in a convenient little gauge?

I don't wanna buy an analog boost gauge. They're entirely too expensive.

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Old 03-31-2015, 11:42 PM   #2 (permalink)
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Old 04-01-2015, 05:44 PM   #3 (permalink)
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There are several cheap boost gauges on eBay as well, just didn't wanna get something that'll crap out quickly and also thought it might be neat to see what the MAP sees in real time.
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Old 04-02-2015, 02:51 AM   #4 (permalink)
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Sure, just put a VOM on the signal line.
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Old 04-02-2015, 03:51 AM   #5 (permalink)
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I used one of those LED oxygen sensor gauges and a potentiometer to drop the voltage from the 0 - 5V of the MAP sensor down to the 0 - 1V for the gauge. It works very well!
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Old 04-02-2015, 12:13 PM   #6 (permalink)
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That's actually a very good and creative way to do it but the o.p. Indicated they didn't want to spend a dime.
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Old 04-02-2015, 07:04 PM   #7 (permalink)
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Quote:
Originally Posted by markweatherill View Post
I used one of those LED oxygen sensor gauges and a potentiometer to drop the voltage from the 0 - 5V of the MAP sensor down to the 0 - 1V for the gauge. It works very well!
In another thread I have posted a simple circuit that does this. Yes, it works! <$20. The proviso is that the MAP signal puts out a 0-5V signal.

An alternative is to connect the voltage divider to a cheap digital multimeter (volt meter). I can buy these for <$5.

Use the voltage divider to avoid shorting the MAP signal through the (1M ohm impedance) meter and to scale the signal from 0-5V to the units you want to see.

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