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analog, digital guages


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zister 
Member - Posts: 2
Member spacespace
Joined: October 18, 2011
Location: British Columbia, Canada
Posted: November 03, 2012 at 9:30 PM / IP Logged  

hi, looking for info on running analog & digital guages simultaneously.

I have a 92 s15 jimmy with a digital cluster & I have added a pillar guage pod with three analog guages one battery-oil pressure -& water temp. how do I hook up the analog without interupting the oem guages & vice versa

please any help would be appreciated!

howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: November 04, 2012 at 1:29 AM / IP Logged  
You wire them in parallel and cross your fingers that the signal sources have enough current to swing both sets of gauges, all rather pointless (no pun intended) IMO.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: November 04, 2012 at 4:04 AM / IP Logged  
In short, no.
Analog gauges require senders/sensors matched to their requirements.
Normally these sensors are added - eg, oil galley & head water-jacket.
The voltmeter can simply be connected across the battery (thru an IGN +12V controlled relay if wanting it off when IGN is off).
"Digital gauge" sensors may be high-impedance types since the (analog to) digital circuitry merely requires a voltage.
They are usually unable to handle the current requirements of analog gauges even if they were to be matched, but the analog gauge would effect the digital reading (unless the analog meter replaced the dropping resistor for the digital sender, which IOW - forget it.
Besides, wouldn't you rather have redundant or two independent methods to measure the same parameter in case one gauge fails? (IE - as per Howard, "rather pointless" except when the superiority of an analog gauge is desired, though IMO the voltmeter is one of the few cases where a 3-digit gauge is the superior, and I understand why both are desirable for others like speed & RPM.)
If not and you want to use existing sensors, get an electronic analog meter or a voltmeter which is high-impedance and unlikely to effect the "digital" sensor output. Current-meter or "normal" analog gauges are unsuitable without an added conversion circuit - eg, a transconductance amplifier.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: November 04, 2012 at 4:28 AM / IP Logged  
Oops I read that the wrong way round, I thought the analogue gauges were original so I gave exactly the wrong reasons.
I withdraw my previous post and I'm now X 2 with Oldspark.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: November 04, 2012 at 6:11 AM / IP Logged  
Ah - thanks Howard.
Though you were not incorrect, I though it a somewhat strange reply given your knowledge - ie, though not incorrect, the chances of it being a reality are so slim.
(Even the chances of matching things as I described are slim, and that's after investigating or pulling apart; and substituting; and voiding warranties; and risking destruction; and & &...)
As to withdrawing posts - wow, did I just have a bad! (I won't mention "12V light flasher".)
These damned OldFart's that skim thru and think they know it all! ("it all" as in what's in the thread.)
They're as bad as injuneers!
zister 
Member - Posts: 2
Member spacespace
Joined: October 18, 2011
Location: British Columbia, Canada
Posted: November 04, 2012 at 11:02 AM / IP Logged  
thanks for the info, I knew there was a signal shortage & I would need a different curcuitb to run the analog. but I didn't know what. Where or how do i make a transcunductance curcuit ? What is a transcunductant curcuit?
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: November 04, 2012 at 6:21 PM / IP Logged  
Google it.
And - good luck!

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