 Oil temp gauge wiring, parallel guage setup |
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| ahdoman |
  Dec 27 2006, 11:12 PM
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#1
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It's phonetic...Ah-D-O-Man (Audioman)  Group: Members Posts: 667 Joined: 7-November 05 From: Santa Clarita, Ca. Member No.: 5,084 Region Association: Southern California  |
I have an oil temp gauge in my center console. It appears the PO unwired the temp gauge above the fuel gauge and wired the send to the one in the center console. Can I run the two gauges simultaneously? It's not mandatory it's just I don't like having a gauge not working. If I can how should it be wired?
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| markb |
Dec 28 2006, 01:17 AM
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#2
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914less :( Group: Members Posts: 5,449 Joined: 22-January 03 From: Nipomo, CA Member No.: 180 Region Association: Central California 
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You need to make sure the sender is correct for the gauge. I doubt both gauges use the same sender, but I've been known to be wrong before.
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| John |
Dec 28 2006, 02:21 AM
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#3
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member? what's a member? Group: Members Posts: 3,393 Joined: 30-January 04 From: Evansville, IN (SIRPCA) Member No.: 1,615 Region Association: None |
I believe that if you try to run both gauges from the same sending unit that neither gauge will read correctly. (at least they didn't in my car)
I had the center console gauge and a fuel/temp gauge both installed in my street car when it was a 2.0 and at one time I wired both up. Both gauges would function, but each read about 1/2 what they should have. I didn't calibrate them, just an approximation. I went back and removed one of the two gauges and all was normal. Just my experience. |
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| ejm |
Dec 28 2006, 06:45 AM
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#4
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I can see the light at the end of the tunnel Group: Members Posts: 2,707 Joined: 3-February 03 From: Massachusetts Member No.: 224 Region Association: None |
Gauges work by measuring the resistance to ground through the sender. If you hook two gauges to the same sender each gauge will see a ground path through the sender and the other gauge causing incorrect readings. Using a couple of diodes between the gauge and where the sender wire splits should allow both gauges to read correctly. In theory anyway (IMG:style_emoticons/default/smile.gif) Diodes allow current flow in one direction only and would block each gauge from seeing two ground paths. Radio Shack has packages of diodes for a buck or two if someone whats to try it out.
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| McMark |
Dec 28 2006, 10:26 PM
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#5
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Hook up the dash gauge, get a CHT gauge for the console. Problem solved. (IMG:style_emoticons/default/beerchug.gif)
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| markb |
Dec 29 2006, 12:58 AM
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#6
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914less :( Group: Members Posts: 5,449 Joined: 22-January 03 From: Nipomo, CA Member No.: 180 Region Association: Central California
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QUOTE(McMark @ Dec 28 2006, 08:26 PM)  Hook up the dash gauge, get a CHT gauge for the console. Problem solved. (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/agree.gif) |
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| ahdoman |
Dec 29 2006, 09:55 AM
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#7
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It's phonetic...Ah-D-O-Man (Audioman) Group: Members Posts: 667 Joined: 7-November 05 From: Santa Clarita, Ca. Member No.: 5,084 Region Association: Southern California |
QUOTE(McMark @ Dec 28 2006, 08:26 PM) Hook up the dash gauge, get a CHT gauge for the console. Problem solved. (IMG:style_emoticons/default/beerchug.gif) What is the difference of a CHT gauge vs. the VDO? Besides, I already own the VDO and everything else is also VDO (oil pressure, clock, head temp) so it needs to match. |
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| John |
Dec 29 2006, 11:42 AM
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#8
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member? what's a member? Group: Members Posts: 3,393 Joined: 30-January 04 From: Evansville, IN (SIRPCA) Member No.: 1,615 Region Association: None |
CHT Gauge = Cylinder Head Temperature Gauge
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| Joe Bob |
Dec 29 2006, 11:45 AM
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#9
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
One's a brand name the other is not....VDO does make a CHT....the sender ring goes around the spark plug in most cases.
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| ahdoman |
Jan 4 2007, 10:32 AM
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#10
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It's phonetic...Ah-D-O-Man (Audioman) Group: Members Posts: 667 Joined: 7-November 05 From: Santa Clarita, Ca. Member No.: 5,084 Region Association: Southern California |
Per my original post.. I have both a head temp gauge and a oil temp in my center console (along with an oil pressure and a clock). What I want to do is parallel the oil temp in the console (VDO) with the one in the factory (gas & temp) gauge.
Ed - the diodes seemed to do absolutely nothing. If I hook up both gauges they do indeed change the resistance value of the sender and both read an incorrect lower temp. Does anybody know the resistance value of the oil temp sender? Can I wire a couple of resistors in line with the gauges to re-create the value the sender wants to see? |
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| Demick |
Jan 4 2007, 11:15 AM
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#11
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Ernie made me do it! Group: Benefactors Posts: 2,312 Joined: 6-February 03 From: Pleasanton, CA Member No.: 257  |
Why do you really want two gauges that show the same information?
I don't think there is any reasonable way to get both to work properly from the same source - especially given that there is a 90% chance that they are calibrated for different resistance senders. I'd just focus on getting one gauge to work properly. If it was my choice, I would get the combo gauge to work correctly, and scrap the center console gauge. If you need to fill the extra hole in the center console - just get a volt gauge. Demick |
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