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Old 02-24-2020, 06:36 PM   #4
ray_mcavoy
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Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,354
Re: Oil pressure gauge install information for disconnect.

Quote:
Originally Posted by Dead Parrot View Post
Don't mess with the union. Instead, put a T right off the block and on one arm of the T, put the existing oil gauge tubing. On the other arm, put the idiot light sensor.
I agree, leave the union as-is and put the T fitting right off the block. I think the union was there just to make things easier on the assembly line. The two pieces of tubing connected with a union were easier to install compared to trying to fish a long piece of tubing through a relatively small hole in the firewall.

Quote:
Originally Posted by Thealien View Post
Fittings are odd size.
Yes, the factory oil lines use a compression sleeve nut fitting ... basically has the compression ferrule built into the nut instead of being a separate ring. Replacement nuts are available as Weatherhead #6100x2 or Edelmann #111200. And the connector that goes into the 1/8" NPT threads in the block is Weatherhead #6200x2 or Edelmann #112220. Although some of the factory ones on small block V8s used a longer connector since it fits in close behind the rear edge of the intake manifold.
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