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#21
03-28-2022, 05:06 PM
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I repair tachometers and calibrate gauges as a side. IMO, the best senders I like to use are NAPA for oil pressure and Lectric Limited for water temp. There is a good informational page about senders on LL`s website. In summary, most all senders are not being made to the GM specs our cars were born with. A parts store sender may be way off, unless it's been checked and verified electrically. The LL water temp sender is made much closer to original spec than any other. They are only $25 or so. The NAPA oil senders seem to be more linear and have less hysteresis (stiction) than ones I have tested. They are around $30.
Part numbers: LL 6402383 Napa OP 6636 (80 psi), OP 6637 or 6640 (60 psi) Sent from my SM-T817V using Tapatalk |
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#22
03-28-2022, 05:11 PM
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Thanks much!
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
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#23
03-29-2022, 11:03 AM
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Is there anything inherently wrong as it relates to function with buying a NAPA NOS oil pressure sender - made in USA?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project Last edited by grivera; 03-29-2022 at 11:15 AM. |
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#24
03-29-2022, 11:19 AM
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Quote:
Sent from my SM-G991U using Tapatalk |
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#25
03-31-2022, 06:28 PM
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Just an FYI on sending units, they can vary widely. Just for kicks a year or two ago I bought 5 different temperature sending units from various sources, all supposedly for the '67 GTO. In boiling water (212F), the resistance on the units varied. A LOT.
The gauges are probably not at fault for bad readings as much as the sending units. When I get my current project running it will be interesting to see the difference between the temp sending unit supplied by Holley for the EFI vs. the gauge in the car.
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461 Stroker Built by Me - 
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#26
03-31-2022, 11:28 PM
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Years ago I bought a very nice set of Auto Meter gauges for the red GTO and figured this was a good time to check the Rally gauges in the blue car. Hooked the new gauges up and went a couple weeks with both sets reading the same. Transferred the Auto Meter gauges to the red GTO knowing the stock gauges were doing fine.
My water temp Rally gauge has been hardly moving off the peg during this winter and I do have a thermostat. Took the temp gun and it sure looks like the thermostat stuck open. At least a thermostat is a lot cheaper than a new sender.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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#27
04-01-2022, 11:35 AM
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Mike - seems the gauge was working in your case, no? I assume at 120 degrees the needle was where it needed to be?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded) '69 LeMans Vert, 350, #47 heads: Non-running project |
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#28
04-01-2022, 02:25 PM
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Yep. Thought maybe the sender or gauge had succumbed to old age, but the temp gun showed that the low reading was correct.
__________________
Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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