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Old 11-27-2009, 11:16 PM   #1 (permalink)
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Default 1968 ford mustang instrument voltage limiter(regulator)

Hi there, i have a 1968 mustang with stock gauges. Origionally when i bought the car, all gauges were pegging. I metered the cvr and found 12v in and 12v out. So i replaced the cvr and my fuel, and water temp gauges started working fine, but my oil press just sat reading below the L. I have a new sending unit installed and the wire from the sender to the gauge has continuity. I grounded the wire from the sending unit and the needle on the oil press gauge flickered and only swung half way, so i replaced the gauge with another stock gauge from a friend who didnt know if it worked or not. As soon as i put it in, it smoked the cvr, tried another cvr and it smoked to. Put another cvr in and my old gauge, and the cvr didnt smoke, but my old oil press gauge still doesnt work. Everything else still does work in the cluster though.

Why did the other oil press gauge blow the cvr, is the cvr fused, or is it a fuse itself. Do you think the oil press gauge from my friend is actually blowing the cvr, or do i have another prob. Im thinking i have to find a working oil pressure gauge.


Thanks guys
Ray
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Old 11-28-2009, 12:55 AM   #2 (permalink)
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Quote:
Originally Posted by rsomerton View Post
Hi there, i have a 1968 mustang with stock gauges. Origionally when i bought the car, all gauges were pegging. I metered the cvr and found 12v in and 12v out. So i replaced the cvr and my fuel, and water temp gauges started working fine, but my oil press just sat reading below the L. I have a new sending unit installed and the wire from the sender to the gauge has continuity. I grounded the wire from the sending unit and the needle on the oil press gauge flickered and only swung half way, so i replaced the gauge with another stock gauge from a friend who didnt know if it worked or not. As soon as i put it in, it smoked the cvr, tried another cvr and it smoked to. Put another cvr in and my old gauge, and the cvr didnt smoke, but my old oil press gauge still doesnt work. Everything else still does work in the cluster though.

Why did the other oil press gauge blow the cvr, is the cvr fused, or is it a fuse itself. Do you think the oil press gauge from my friend is actually blowing the cvr, or do i have another prob. Im thinking i have to find a working oil pressure gauge.


Thanks guys
Ray

I would agree with you the gauge you got from your friend is shorted! NPD has new repro oil guage for $58.95. I'll bet if you put an ad (posting) in the
mustang parts wanted forum you'll get many responses! Lots of people have parts like this in their store room.

Good luck,
Slim

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Old 11-28-2009, 02:42 AM   #3 (permalink)
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Originally Posted by rsomerton View Post
Hi there, i have a 1968 mustang with stock gauges. Origionally when i bought the car, all gauges were pegging. I metered the cvr and found 12v in and 12v out. So i replaced the cvr and my fuel, and water temp gauges started working fine, but my oil press just sat reading below the L. I have a new sending unit installed and the wire from the sender to the gauge has continuity. I grounded the wire from the sending unit and the needle on the oil press gauge flickered and only swung half way, so i replaced the gauge with another stock gauge from a friend who didnt know if it worked or not. As soon as i put it in, it smoked the cvr, tried another cvr and it smoked to. Put another cvr in and my old gauge, and the cvr didnt smoke, but my old oil press gauge still doesnt work. Everything else still does work in the cluster though.

Why did the other oil press gauge blow the cvr, is the cvr fused, or is it a fuse itself. Do you think the oil press gauge from my friend is actually blowing the cvr, or do i have another prob. Im thinking i have to find a working oil pressure gauge.


Thanks guys
Ray
I would be interested in the outcome as my 67 oil presure gauge also sits just above the L side ,was thinking of changing it...as it seems to work but never rises more than i said...thinking after 40+ years it could be faulty.
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Old 11-28-2009, 02:57 AM   #4 (permalink)
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Take care when installing gauges that one or both "posts" don't contact the instrument panel housing. Otherwise you'll be chasing your shorts for a while.
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Old 11-28-2009, 07:20 AM   #5 (permalink)
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Take care when installing gauges that one or both "posts" don't contact the instrument panel housing. Otherwise you'll be chasing your shorts for a while.
This is almost certainly what happened. The crappy cardboard on the back where the posts attach is actually a very effective insulator, but it's very easy to get it slightly wrong and let the smoke out of your instruments. Before you fry another $100 worth of CVR's check this out.
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Old 11-29-2009, 01:36 AM   #6 (permalink)
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Thanks for all the insight guys, i took apart the oil press guage, and the heating strip that has the coil around it that heats up and deflects the needle was disconnected from the needle itself and shorting out. Reconnected it very carefully, calibrated it, reassembled, and now all stock gauges are working fine. Thanks for all the info guys, it was a great help.

Ray
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