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  1. #1
    mrbtd's Avatar
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    How to for Water Pressure gauge ?

    I have a autometer mechanical pressure gauge and I am trying to figure out how to go from the 3/4 supply line to the 1/8 on the gauge. Obviously it needs a t or Y fitting but I cant find one @ Grainger or McMaster Carr.

    Any tips ?


  2. #2
    cheatin' piston popper addicted's Avatar
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    get a brass or aluminum hose splice (double barb) drill and tap it 1/8npt

  3. #3
    mrbtd's Avatar
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    Thats a great idea. I tried home centers and harware stores for the splices with no luck though.

    Where did you get yours ? Was it a 3/4 or 1/2 splice ?

  4. #4
    cheatin' piston popper addicted's Avatar
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    I made one out of aluminum, but I have seen barded ones at ace. I know the threads will be thin, but if you solder it together you should have no problem.

  5. #5
    My son (mohawk man) jeffsntx's Avatar
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    Bill, if you go to a GOOD auto parts store, they make 5/8 and 3/4 hose splices with 3/8 nipples on them. Then you just put a nipple on the back of the gauge so that you can temp. mount the gauge on the dash somewhere. I fount it a little difficult to go WFO across the water without the seat and look down to see what the water pressure was. After you have the pressures set you can put the gauge back under the seat to check the pressures every now and then. I have mine plumbed like Mike said. I found a brass hose barb and drilled it for 1/8 NPT. Either way will work.

  6. #6
    mrbtd's Avatar
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    thanks for all the help guys. Rapidacceleration also reminded me I could use the extra 1/8 hole in the open loop cooling plate.

    I am monitoring the temp @ the reducer and the water pressure right inside the plate so I think I am good now.

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