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Tachometer Mod? Anyone heard of it?

post #1 of 19
Thread Starter 
It seems like it would possible to somehow make a tachometer display something like HDD activity or ???. I want to use a tach on one of my mods and have no clue how to start tweaking it to make it do somehing interesting.

Also I was wanting to know the proper way to hook a voltmeter and ammeter to the PSU. I assume I could just put a molex on the voltmeter...but I am not exactly sure how to get a good reading off an ammeter...would it not have to be in series...i.e. interrupt the circuit that is under load...if so which circuit should I interrupt to get a true reading?

I have this "HotRod" looking mod that I want to put a cluster of gauges on...I found a pressure gauge for the LC now I am looking for temp, volt, amp, and maybe a tach or speedo..if I can figure how to mod it...

Thanks in adavance

CyberDruid
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post #2 of 19
well... all i can help you with, is that advanced auto parts has all those for <$20 a pop
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post #3 of 19
Thread Starter 
true.. I have been and I have seen
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post #4 of 19
voltmeters have to be in parallel circuits because the voltage is the same everywhere. Ammeter is in series circuit because current is the same everywhere. This probably doesnt help at all
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post #5 of 19
The voltmeter can be wired right to a molex, I did this in my PC, I have pics if you want.
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post #6 of 19
There is this, but its discontinued it looks like. This case also has an analog read out. It looks like in both cases it connects to a serial or USB port and software sends it data. I would doubt you would be able to read anything besides the voltage/amps from the PSU without using software. Now of course when something (like a hard drive) is in use its amp draw will go up so you could measure something like that on the power cable just before it connects to the device. Perhaps with a shunt of some sort.
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post #7 of 19
It'd be sick to have all your fans on a tachometer and it be cumulative, but that sounds near impossible to do. >_< (IE, 1000RPM fans x5 = 50mph, etc.)

Multimeter Q:
What you wanna read with the volt/multimeter? Don't try to measure the current/amps on your PSU...you'll kill it, your multimeter, and maybe "something" else.

If you mean rails, turn PC off, take a molex. For 12V rails, stick ground probe in a ground, the hot probe in yellow.

5v = just a molex again, ground probe in ground, hot in red.

3.3v = couldn't tell you. Seeing as 3.3v lines in your rig are orange lines, while your PC is off, stick the ground on a ground (molex or ATX connector) and the hot on an orange connector in the ATX (just slip it in next to the cable, should fit), and power on.

Get someone else for the 3.3v, dunno really. Pretty sure that'd work fine, since you *can* measure both the 5v/12v rails in the same way, it's just easier to do it with the molex.

*edit*
After seeing other users responses...I think I read it wrong. My bad. >_>
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post #8 of 19
Thread Starter 
So if I interrupt the yellow lead on a PCIe power cable then I am reading amps to the card...but is i interupt a power lead ont he 24 pin then I am getting amps to the mobo..right? I am not going to get the same reading at both locations...how could I get the amps drawn on the PCIe cable from interrupting the 24 pin or vice versa...

hence my query: where to intterupt the power cables for the best ammeter reading..or does it really not matter--just tap into any cable? that makes no sense to me--if I just interrupt a lead that is not plugged in to anything I get no amps...
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post #9 of 19
Thread Starter 
Of course the PC Tachometer is discontinued and out of stock lol...that would be great.

I want to have a real time read out of voltage and temps and pressure on the rig...not toys..actual functional gauges. I think it would be cal-i

Thanks for the help!
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post #10 of 19
Quote:
Originally Posted by CyberDruid View Post
Of course the PC Tachometer is discontinued and out of stock lol...that would be great.

I want to have a real time read out of voltage and temps and pressure on the rig...not toys..actual functional gauges. I think it would be cal-i

Thanks for the help!


So something like that?

(Though...modern...and for a computer...)
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