Chevy Nova Forum banner

1 - 10 of 10 Posts

·
Super Moderator
Joined
·
9,796 Posts
Discussion Starter #1
I have a used mechanical temperature gauge I'd like to install, and I don't have the instructions. It has a long 1/4" covered tube that goes to the sensor that bolts into the engine.

Here's the question: does that tubing come apart any more...or do I have to drill a hole in the firewall big enough (5/8-3/4" maybe) to thread the sender nut through? I'm guessing that it doesn't come apart (without breaking it) and I need the mondo hole.

Kinda like this:

 

·
Premium Member
Joined
·
7,757 Posts
You cannot disconnect the capillary tube. You must drill a hole big enough to fit it through and then use a rubber grommet to seal the hole with the tube sticking through it. If you cut the tube or damage it, you might as well throw the gauge away because it is ruined.
 

·
Registered
Joined
·
201 Posts
On my 68 I routed the capillary tube through the speedometer cable hole. Removed the firewall seal around the cable and put a rubber grommet around the speed cable, temp gage capillary and oil pressure line. Pushed the grommet into place, routed the lines and used a little RTV to seal the rest of the opening in the grommet. Not exactly a factory look but didn't look bad.
 

·
Premium Member
Joined
·
2,241 Posts
temp gauge install..

next question...where are you going to connect it...head or intake..??? some aftermarket intakes have a provision near the t/stat housing for a connection...or use the drivers side cylinder head. They usually read a little hotter at the head..

wilma
 

·
Premium Member
Joined
·
2,112 Posts
I installed the bulb on mine in the front of the intake manifold, close to the thermostat. Here it is right next to the "USA" sticker.

Below and to the left, almost hidden behind the hose, is the temperature sensor for the fan relay. I think either spot would work alright.

Dave
 

·
Super Moderator
Joined
·
9,796 Posts
Discussion Starter #10 (Edited)
That's where you want it. Putting it in the head doesn't give you as valuable information.
That spot on the intake is exactly where I have it installed now. Actually, I *was* planning on putting it in the head (to hide the sender tube) but while I was on the engine stand I discovered that the coolant passages in the heads were different enough that it wouldn't fit. I could get the bushing in, and the probe would go most of the way in, but it still was about 1/4" from seating properly. So...I plugged the heads instead and put my electric one in, but that one isn't working right, and now I have the mech one there instead.
 
1 - 10 of 10 Posts
Top