Speed but oil pressure sender?

[Jacob]

My second oil pressure sender apparently crapped out on me. First one the + pole broke off. Pressure was good for a few minutes and then went to zero. Checked with a manual gauge and pressure was 60 at idle. So I’ve ordered my 3rd sender(now have 1.0 miles on my car)...question is...are there any alternatives out there for this type sending unit? Ironically I was moving my car out of the garage for graduate pics!

[edwardb]

Assume you mean the third sender and not the third full gauge. Pretty certain you need to use the sender from Speedhut, so no options there that I'm aware of. I personally haven't had any failures with the several I've used. But it's mentioned enough on here that quality does appear to be an issue. I have broken the pole on one though, so I know from experience that part is a bit fragile. You need to be really careful to not over-tighten it. The most recent sender I received with my Coupe kit was slightly different than previous ones. Seems maybe Speedhut changed something? I don't know. No suggestions other than to speak with Speedhut and describe your experience. They have good customer service and may help you out. May also have some suggestions.

[Olli]

Why are you ordering new gauges ( "So I’ve ordered my 3rd gauge" ) when you have been having issues with the sender? And did you mean Speedhut? I've always had very good customer service with Speedhut. They do stand behind their products.

Olli

[Jeff Kleiner]

Yes, they do have good customer service---they kinda' have to. I've had several Speedhut OP senders fail (on multiple cars) when mounted directly to the engine. After about the fourth episode I started remote mounting them to the F panel and running a section of 2-AN hose between the sender and engine. No failures since. Coincidence? I don't think so...

Jeff

[Jacob]

No, no..my mistake, 3rd sending unit!!! Gauges are fine!

[Jacob]

Yes, they do have good customer service---they kinda' have to. I've had several Speedhut OP senders fail (on multiple cars) when mounted directly to the engine. After about the fourth episode I started remote mounting them to the F panel and running a section of 2-AN hose between the sender and engine. No failures since. Coincidence? I don't think so...

Jeff

That’s interesting? Just may try that on the next attempt. BTW, would anybody here happen to know how to benchtest the sender? I got some resistance, not sure how much I should have?

[mike223]

BTW, would anybody here happen to know how to benchtest the sender? I got some resistance, not sure how much I should have?



Got a good (Fluke) meter? - You'll need one.

If you've got three wires going to the sender, here's how they work:

Red = 5 VDC reference to sender from gauge.
Black = 0 VDC reference to sender from gauge.
White = .5-4.5 VDC signal to gauge from sender - this is based on the span of the sender, not the meter.

For instance Speedhut part# G-SNDR-02: https://www.speedhut.com/ecommerce/product/604/Pressure-Sensor---30-psi-(Revolution-and-Legacy) reads .5 VDC at 16" vacuum + 4.5 VDC at 30 PSI. So if you had a 0-15 PSI gauge it's going to peg the needle at ~ 3.5 VDC (15 PSI).

I do not know the specifics of part# G-SNDR-01: https://www.speedhut.com/ecommerce/product/600/Pressure-Sensor---100-psi-(Revolution-and-Legacy) which is what you are probably using on your oil pressure gauge, but Speedhut is really good at answering emails through their website and they will provide that information if you ask. https://www.speedhut.com/contact.html

[edwardb]

That’s interesting? Just may try that on the next attempt. BTW, would anybody here happen to know how to benchtest the sender? I got some resistance, not sure how much I should have?


Got a good (Fluke) meter? - You'll need one.

If you've got three wires going to the sender, here's how they work:

Red = 5 VDC reference to sender from gauge.
Black = 0 VDC reference to sender from gauge.
White = .5-4.5 VDC signal to gauge from sender - this is based on the span of the sender, not the meter.

For instance Speedhut part# G-SNDR-02: https://www.speedhut.com/ecommerce/product/604/Pressure-Sensor---30-psi-(Revolution-and-Legacy) reads .5 VDC at 16" vacuum + 4.5 VDC at 30 PSI. So if you had a 0-15 PSI gauge it's going to peg the needle at ~ 3.5 VDC (15 PSI).

I do not know the specifics of part# G-SNDR-01: https://www.speedhut.com/ecommerce/product/600/Pressure-Sensor---100-psi-(Revolution-and-Legacy) which is what you are probably using on your oil pressure gauge, but Speedhut is really good at answering emails through their website and they will provide that information if you ask. https://www.speedhut.com/contact.html

The oil pressure sensor used with the Factory Five Speedhut Vintage gauges is a 2-wire resistive type. This one: https://www.speedhut.com/ecommerce/product/603/Resistive-Pressure-Sensor---100-psi,-240-33-Ohms-(Speedhut-Line). Real quick Google search didn't find any alternatives for a 100 psi, 240-33 ohms range sensor similar to this one. Might be something out there, but didn't see anything. Could be tested with a VOM while in operation I suppose. But since your gauge is good as far as you know, just as easy to hook it up and see what you have.

[mike223]

The oil pressure sensor used with the Factory Five Speedhut Vintage gauges is a 2-wire resistive type. This one: https://www.speedhut.com/ecommerce/product/603/Resistive-Pressure-Sensor---100-psi,-240-33-Ohms-(Speedhut-Line).



I didn't know that - ordered all my gauges directly from Speedhut on Black Friday sales over the years.


To be clear:

The three wire sensors are capacitive and reading resistance doesn't work on them.

The Speedhut website doesn't currently show any resistive type pressure gauges (but I agree they used to - and obviously they still list the sensor for that type of gauge).

https://www.speedhut.com/gauges/Pressure-Gauges/?catid=f232|f7&sortby=customer_price&i=18&p=1

[Jeff Kleiner]

Yep, every Speedhut pressure sender I've seen (and that's a lot, including 5 of 'em in the shop right now) has been 2 wire.

Jeff

[Dave Howard]

I too had a flaky oil pressure sending unit from Speed hut on the initial start of my crate Coyote. Like Oli and Jeff have said, they do have excellent customer service. I'd keep at themJacob. Eventually, you,ll get a good one that should last you for years.

[Jacob]

I too had a flaky oil pressure sending unit from Speed hut on the initial start of my crate Coyote. Like Oli and Jeff have said, they do have excellent customer service. I'd keep at themJacob. Eventually, you,ll get a good one that should last you for years.

Thanks all, I’m planning on a remote mount per Jeff’s suggestion...we’ll see how that goes? Planning to push S H on giving me a replacement so at least I’ll have a spare!

[Jacob]

Here is the SH response to my question of how to bench test.

[B][/Yes, here are some reference you can compare against for pressure vs ohms.

I’m getting 1.3 ohms. Waiting on their response, so I’ll pass along when I get it.

0 psi - 240 ohms
50 psi - 143 ohms
60 psi - 124.5 ohms
70psi - 101 ohms
80 psi - 79 ohms
85 psi - 61 ohms
90psi - 44.4 ohmsB]

[Jacob]

For follow up, SH is sending a warranty replacement (voluntarily), it impresses me that they saw where I had ordered one and will credit me back for it. I still intend to mount remote with copper tubing from the motor to the sender.

[Boydster]

For follow up, SH is sending a warranty replacement (voluntarily), it impresses me that they saw where I had ordered one and will credit me back for it. I still intend to mount remote with copper tubing from the motor to the sender.

Make sure there's some flex hose in that remote mount somewhere. Copper tubing will crack with the vibration of the engine over time.

[Jeff Kleiner]

I still intend to mount remote with copper tubing from the motor to the sender.

NO! As I said in post #4 use braided hose, not copper.

Jeff

[mike223]

NO! As I said in post #4 use braided hose, not copper.




Agreed.

AN is great.

Another suitable product is the Gates LOC line of hose + fittings.

[Jacob]

Final story:
1st a sincere apology to Speedhut! I am really embarrassed but this is how it happened, hoping others can learn from my mistakes!
1. Even after disconnecting the oil pressure sensor the gauge fuse was still tripping
2. Only way to not trip the fuse was to keep the water temperature and oil pressure disconnected
3. Lucky for me I built the dash so that it could be removed!
4. Just guessing that the “extra” power input in the daisy chain for the gauges is for oil temp?
5. What are the chances but the pinpoint area of the power (red wire) had shorted out to one of the small aluminum brackets. See pic.
6. Insulated the male plugin and now all is good.
7. Calling Speedhut and telling them the story and making sure I pay for their replacement.
8. Maybe some others can learn from my mistake.
.
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[phileas_fogg]

Glad you found your problem, and even more glad you shared it. You've saved someone down the road considerable time & effort in their troubleshooting.

Cheers,


John