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  1. #1
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    Sep 2009
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    674

    Default Water Pressure Sensors

    GM block,
    Where is the usual place for the switch?
    I was considering the 1/8" NPT ports at the bottom of the water jackets just above the pan rail

  2. #2
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    May 2007
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    613

    Default

    My radiator has a pre tapped spot for it. Drivers side about 4' up from the bottom.

  3. #3
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    Oct 2017
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    Doesn't matter where you put it weve run it right in the top of the water pump, in the intake or thermostat housing spacer. Theoretically the block could have more pressure as a result of the restrictions from gaskets,thermostats or restricter plates. But it is my experience that if that's true it's minimal because I've run them about everywhere but ever your suggesting and they work just fine

  4. #4
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    May 2007
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    Default

    Quote Originally Posted by Lizardracing View Post
    GM block,
    Where is the usual place for the switch?
    I was considering the 1/8" NPT ports at the bottom of the water jackets just above the pan rail
    Typically there are in the thermostat housing or the intake, but as said anywhere is fine. However I would probably not select the block there, just for the fact it's likely to get knocked off from dirt/debre like the little jumper wire on the starter gets broken often.

  5. #5
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    Oct 2017
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    Default

    Quote Originally Posted by billetbirdcage View Post
    Typically there are in the thermostat housing or the intake, but as said anywhere is fine. However I would probably not select the block there, just for the fact it's likely to get knocked off from dirt/debre like the little jumper wire on the starter gets broken often.
    Agreed aswell as the water flow in that area of the block is relatively low so their tends to be sediment/ rust build up down their at times this could be detrimental to the sensor

  6. #6
    Join Date
    May 2007
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    in a van down by the river
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    Default

    I had mine in the water ports running from the back of the intake to thermostat housing. Fragola has a -6 male to male connector block that has a 1/8" hole tapped for it
    I think there should be lifeguards in the genepool.

  7. #7
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    May 2007
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    Default

    We spoke of these previously and someone mentioned one from parts store that works great, maybe old Chevy? Anyways, y'all wouldn't happen to know what or part # of something local that works good? Tried the Longacre route and it seems to be bad or wrong sensor as billet diagnosed. Wanting something to solve issue now not later

  8. #8
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    Quote Originally Posted by Jim11h View Post
    We spoke of these previously and someone mentioned one from parts store that works great, maybe old Chevy? Anyways, y'all wouldn't happen to know what or part # of something local that works good? Tried the Longacre route and it seems to be bad or wrong sensor as billet diagnosed. Wanting something to solve issue now not later
    Jim, check this out https://www.amazon.com/ACDelco-C8020...B7FA4F5XMHTKSG

    From what I read it's 5psi and is grounded when below 5 PSI and not above 5 PSI, so should be correct the way I read it and the comments below.

    If you have an old school parts store with an older parts guy that can look stuff up, look for a oil pressure sending unit that just has an oil light and no gauge and it should work. Most are around 5 PSI that I can remember, you just need a experienced parts guy that doesn't look up parts by year and the computer, lol.
    Last edited by billetbirdcage; 08-13-2020 at 02:22 PM.

  9. #9
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    That part number fits:

    Results may be incomplete due to size of result set
    AMERICAN MOTORS 1958-1979
    AUSTIN 1969-1972
    BUICK 1959-1985
    CHEVROLET 1960-1990
    CHRYSLER 1984
    DODGE 1984-1988
    EAGLE 1988-1989
    FIAT 1966-1970
    FORD 1958-1970
    GMC 1982-1989
    HUDSON 1948-1956
    INTERNATIONAL 1957-1980
    JAGUAR 1970-1990
    JEEP 1959-1991
    NASH 1952-1957
    OLDSMOBILE 1957-1987
    PACKARD 1953-1958
    PLYMOUTH 1984-1988
    PONTIAC 1960-1987
    SAAB 1971-1976
    STUDEBAKER 1956-1964
    TRIUMPH 1967-1981
    VAUXHALL 1959
    VOLVO 1965-1984

    https://www.rockauto.com/en/parts/ac...+/+switch,4588 $5.04

  10. #10
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    Sep 2009
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    Default

    That's awesome to know if I ever need one right now!
    I bought the Longacre one for $15. I needed an adapter for the water jacket hole in the block but it was 1:30am so what are you gonna do? I whittled one out of aluminum on a lathe in about an hour. It's done.

    I am always quite amazed at the number of people who don't realize that most everything on a race car comes from something else but because it's got racing in the name, the price is doubled. I refuse to buy any guage of any kind from any racing source because they are junky and expensive. Instead I buy gauges from industrial gauge assemblies for half the price and work better. A lot of things are like that though.

  11. #11
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    NOTE: Again to be clear that part number appears to be the correct part to do the water pressure light, but I'm going off the listing details and comments that it is correct.

    So use your discretion that it is correct

  12. #12
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    May 2007
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    Your the (not a nice word)(not a nice word)(not a nice word)(not a nice word) billit. I never even thought about the old cars where oil light popped on when low. Had a few them old 70s rides that oil change meant just filter since leaked and burnt faster then the 3k miles lol. I agree on the "racing" items but for one's don't know, forget, or need easy item lookup the racing thing works. Some of the racing stuff built better though to withstand the abuse

  13. #13
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    May 2007
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    I picked up one of 70s Chevy and tada worked excellent. Fire car lights on. Build temp and pressure and light goes off. Especially proved that new in package unit was bad or wrong sensor.

    To be fair: ordered this unit complete thru pit stop USA this spring. Due to rona took little bit to run it. After over month time but only 4 racing nights (verifying I did everything right as well as moving sensor to different spots) with assurance from billet, deemed bad or wrong sensor. I contacted pit stop USA and spoke with them and explained issue and was asked to email them as well with issue. I explained all needed was sensor wasn't looking for anything more. Few weeks after email a complete new kit was arrived. I say this to tell how pleased with their support I was. It was over their return time but guess they understood and definitely made things right. In my opinion went above necessary. Hopefully this helps someone when price shopping items online to know support worth something.

  14. #14
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    Oct 2017
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    Unfortunately those switches come in quite a few flavors(pressure settings) so it's very easy to end up with one that was mislabeled or packaged wrong especially in todays world where quality control is almost non existent

  15. #15
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    Sep 2009
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    Well, this was real handy last week. The radiator cap is bad and the engine slowly lost it water. The pressure light came on the last lap but the gauge never left 210. At home, the radiator was only 1/3 full.
    Last edited by Lizardracing; 10-01-2020 at 03:50 PM.

  16. #16
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    Jul 2009
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    Default

    fuel pressure sensor, its perfect, 3-4 psi under that she lights up

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