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Unread 07-09-2014, 01:04 PM   #1
jeepjerryp7m8
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Mechanical gauge hook up questions

Just bought a set of Auto Meter oil and water temp gauges and quite honestly I haven't installed a set of these things in a long time.
On my 258 oil sender I have an electrical sender and a small black "can" with one wire coming from it, which one do I replace with the new fitting?
Also where does everyone recommend putting the water temp sender, I have a vacuum switch fitting on the intake from leftover emissions stuff, Use that port?
Thanks,
Jerry

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Unread 07-09-2014, 01:10 PM   #2
Varnish
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Assuming your '82 is similar to other 258s I've seen, the larger, usually bell shaped, is the oil sender for the electrical gauge you can replace with the mechanical fitting. The smaller oil thing is a low pressure cutoff switch so you can leave that.

Temp is usually at the back of the head on driver's side - very small sender stock.
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Unread 07-09-2014, 01:34 PM   #3
jeepjerryp7m8
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Just found the stock temp sender, no dice, I have a mechanical temp gauge with the big bulb on the end.
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Unread 07-09-2014, 01:40 PM   #4
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I was able to pull a steel pipe plug out of the aluminum Performer intake manifold (thanks for nothing PO) in a forward water jackon on my 360, it was deep enough for that bulb/sender. Hopefully you'll find a port on your 258.
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Unread 07-10-2014, 11:00 AM   #5
jeepjerryp7m8
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Gauges installed and working. Oil pressure was straight forward and I have 30 psi at warm idle and 55+ at cruising speed.
Temp was easy also, used the port at the front of the intake just below the heater hose. Temp pops up to 190* and stays there. I went on a short shake down and when I got home an idled in the drive for a few minuets and the needle didn't move a bit.
Its really nice to know what is going on.
BTW the stock oil pressure gauge was off by 15-20psi.
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Unread 07-10-2014, 12:31 PM   #6
John Strenk
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Quote:
Originally Posted by jeepjerryp7m8 View Post
...
BTW the stock oil pressure gauge was off by 15-20psi.
Well it is 32 years old. In gauge years it's 96 years old.
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Unread 07-10-2014, 02:50 PM   #7
turbogus
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Quote:
Originally Posted by John Strenk View Post
Well it is 32 years old. In gauge years it's 96 years old.
Right on John
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Unread 07-10-2014, 03:05 PM   #8
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Hopefully you got the copper line for the oil pressure......the plastic line gets brittle pretty fast, not to mention will melt etc.

Many many leaks/ problems with the plastic line.....
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Unread 07-10-2014, 03:23 PM   #9
jeepjerryp7m8
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Originally Posted by Unretarded View Post
Hopefully you got the copper line for the oil pressure......the plastic line gets brittle pretty fast, not to mention will melt etc.

Many many leaks/ problems with the plastic line.....
Oh yeah! Zero trust for the nylon tubing that came with it.
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Unread 07-10-2014, 03:29 PM   #10
Tigerjeep79
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My gauge came with a plastic line. I got a copper one from Jegs, and put a loop in it to handle flex. You have to look for it, but it's there.
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Unread 07-10-2014, 05:46 PM   #11
John Strenk
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And notice the loop in the line also. I think that is important.
It allows for engine movement without straining the line.
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Unread 07-10-2014, 06:17 PM   #12
jeepjerryp7m8
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Originally Posted by John Strenk View Post
And notice the loop in the line also. I think that is important.
It allows for engine movement without straining the line.
Yup. Looped the line and used a grommet. Wrapped the line in one turn of duct tape to provide a little extra protection.
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Unread 07-10-2014, 10:57 PM   #13
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Quote:
Originally Posted by Unretarded View Post
Hopefully you got the copper line for the oil pressure......the plastic line gets brittle pretty fast, not to mention will melt etc.

Many many leaks/ problems with the plastic line.....
I used a Sunpro copper tubing kit to install my Autometer mechanical oil pressure gauge. A complete kit with all the necessary fittings.
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Unread 07-11-2014, 06:15 AM   #14
82JeepCJ7
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I used the plastic line that came with the gauge just to get the gauge installed and test its operation, then I replaced the line with a braided stainless steel line from Autometer.
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