Performance Indicator Gauge

-

bobscuda67

Well-Known Member
Joined
Aug 27, 2005
Messages
2,105
Reaction score
386
Location
Michigan
I have my dash out trying to get the gauges to function. My performance gauge used to work fine two years ago and last year it started to work very slowly.
This year it worked even slower, so now that the dash is out I'm trying to fix it.
I removed the nipple and there was some corrosion inside the nut. What has got me totally confused is what was under the vacuum fitting. There's a staked screw under it with no hole in anywhere in sight.
Ok,
IMG_1290.JPG
I give, how the hell is this supposed to pull a vacuum through it?
 
I have my dash out trying to get the gauges to function. My performance gauge used to work fine two years ago and last year it started to work very slowly.
This year it worked even slower, so now that the dash is out I'm trying to fix it.
I removed the nipple and there was some corrosion inside the nut. What has got me totally confused is what was under the vacuum fitting. There's a staked screw under it with no hole in anywhere in sight.
Ok,View attachment 1715539397 I give, how the hell is this supposed to pull a vacuum through it?
Here's a picture of one from a Dodge console mounted vacuum gauge the nipple removed
probably more questions than answers.

s-l500 (1).jpg
 
Last edited:
I have my dash out trying to get the gauges to function. My performance gauge used to work fine two years ago and last year it started to work very slowly.
This year it worked even slower, so now that the dash is out I'm trying to fix it.
I removed the nipple and there was some corrosion inside the nut. What has got me totally confused is what was under the vacuum fitting. There's a staked screw under it with no hole in anywhere in sight.
Ok,View attachment 1715539397 I give, how the hell is this supposed to pull a vacuum through it?
Needs a 1/8" hose barb fitting like this. or did you just take that off during disassembly?
upload_2020-6-2_19-5-7.png


I beleive inside is a bourdon tube.
 
Years ago I took a drill and opened up the hole. Can't remember how much, but it worked
 
Needs a 1/8" hose barb fitting like this. or did you just take that off during disassembly?
View attachment 1715539412

I beleive inside is a bourdon tube.
Yes the hose barb is in the picture at the top. I put a few drops of penetrating oil in it and it loosened up.
It moves left to right now.
I think you're right that it some kind of tube because it's not a screw.
 
I believe that is a adjustment for it, and has a hole drilled into it. . It is basically a vacuum gauge.
 
Test it for leaking with a mityvac or other vacuum pump.
 
Well I used my HVAC vacuum pump on it yesterday and the needle didn't move. The pump pulls 29" so it should have done something. When the vacuum was on it the coiled arm did move slightly but not enough to get the needle off of the needle rest stud.
I put it back in the dash and gave up on it. It lasted 53 years so I cant complain. I guess it'll be something else to look for at swap meets.
 
I thought I saw one for sale here recently.
 
I had just stated in a recent thread that I have never seen a failed performance indicator. As of this morning that is no longer true. How contamination got there is a interesting question. Vaporizing fuel deteriorating the rubber tube at engine off maybe? Small crack/hole in the brass actuator coil? Who knows?
 
I had just stated in a recent thread that I have never seen a failed performance indicator. As of this morning that is no longer true. How contamination got there is a interesting question. Vaporizing fuel deteriorating the rubber tube at engine off maybe? Small crack/hole in the brass actuator coil? Who knows?

MINE DOESN`T WORK EITHER, HAVE BEEN LOOKING FOR SOMETHING TO COVER IT UP WITH , THAT DOESN`T INVOVLVE REMOVING THE DASH AGAIN . hope to be done w/ that .
 
I'd put a clock in there. Even if that breaks it'll be correct twice a day!:rolleyes:
 
I got it all back together now. It still doesn't work.
If its holding vacuum, but the tube is not moving the link (I assume you opened it) then it would seem like blockage.

Bob's is not cheap but its in Mich. Wolfe is another possible place for getting it fixed.
 
Yes, its holding a vacuum and I put all back together and got the dash installed in the car. I didn't want it to sit while I look for parts.
I'm sure it is some corrosion in it because there was some under the nipple. It's my fault because I left the hose off of the intake three years ago when I changed the cam out.
I think I'll find another one and have that one redone so I can swap them out quick or wait for the winter to repair mine.
 
-
Back
Top