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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 08-30-2013   #1 (permalink)
Centershock is offline Apprentice


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Default Triple Gauge Installation

I would like to install a triple gauge in my 68. Never done this before.
Is there something like a adapter to attach 2 oil pressure gauges to one sensor?

I just would like to have the old gauge working too.

Is the original Temp gauge a water temp gauge or a engine temp gauge?
And can i do the same with the water temp gauge? Like attach them to one sensor?

Thank you guys.

Regards
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Unread 08-30-2013   #2 (permalink)
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Quote:
Originally Posted by Centershock View Post
I would like to install a triple gauge in my 68. Never done this before.
Is there something like a adapter to attach 2 oil pressure gauges to one sensor?

I just would like to have the old gauge working too.

Is the original Temp gauge a water temp gauge or a engine temp gauge?
And can i do the same with the water temp gauge? Like attach them to one sensor?

Thank you guys.

Regards
The original water temp (coolant) gauge is located on the engine block or cylinder head and it's for measuring engine temps. You can attach two oil pressure gauges but they would need to be mechanical gauges, not electrical. Mechanical gauges will give the more accurate readings. You'll need to pickup additional fittings to make it all work.

Jeff

Last edited by koski19; 08-30-2013 at 08:20 AM. Reason: Update
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Unread 08-30-2013   #3 (permalink)
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The gas, oil, and water gauges work by the sensor changing the resistance to ground. I'm thinking adding another item to that circuit would not be good. Also, the older Mustang (and others) gauges work on a 5 volt system and I doubt that newer equipment is compatible.
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Unread 08-30-2013   #4 (permalink)
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Quote:
Originally Posted by Driveway View Post
The gas, oil, and water gauges work by the sensor changing the resistance to ground. I'm thinking adding another item to that circuit would not be good. Also, the older Mustang (and others) gauges work on a 5 volt system and I doubt that newer equipment is compatible.
You're right. The OP would need to separate the newer gauges from the older ones. I think it could be accomplished. He would need to think about installation/operation before purchasing any gauges. He couldn't hook two electrical gauges to the same sending unit. I tried that once on my 82 F150 coolant temp gauge..didn't work and made my factory gauge squirrely and inaccurate.

Jeff
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Unread 09-01-2013   #5 (permalink)
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If it's a 289/302 your '68 should be an electrical oil gauge with the big fat sensor attached to the drivers side front of the block just above the oil pan with a 90* cap wire attached. The sensor will be screwed into a ~2" long hex shaped extension to hold it away from the block due to size of the sensor. You can either tap (drill/thread) a hole into the side of the extension or I removed the extension and ran a pressure hose to a 3 way tee and attached both sensors there. The 2nd gauge should be able to be electric or mech. as it is just taking or reading the oil pressure at it's sensor and sending it to the gauge.

The water temp is a little trickier as you will need to either tap into the water flow at a 2nd location on the intake (original is at the front just behind the Tstat. If you tried to take readings from the original or an aftermarket sensor they would have to operate on the same exact ohms for sending the signal to the gauge. If one of them operates on a different ohm range (at what ohm reading it sends 'hot' to the gauge, etc.) then one of the gauges will be off. One may read normal while the other reads hot, etc. I put a 2nd sensor in another intake hole for my 2nd mech. water temp. gauge.

Jon
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Unread 09-01-2013   #6 (permalink)
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Did anyone aske if these are mechanical or electronic gauges?...
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