Aftermarket Guages

[65GMCFirstride]

I have a 65 GMC truck and I am installing new dolphin gauges. I have researched a lot on the forum and understand that I need a 0-90 ohm fuel sending unit. I know GM changed from 30 to 90 ohm in 1967. Does a 1967 fit a 1965 tank?

Or, do you know someone that can change the resistor?

Thanks!
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[Mack B]

Did you get a sender with your dolphin gauge set? It can be modified to work with your stock pick up assembly. Side note: if I made these up would people buy them? Wat? I'm lookin to be a CEO

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[65GMCFirstride]

They sent a dolphin sending unit with the gauges. It is way different than stock which makes me think that would be an undertaking. Is it difficult and risky since I would be messing around with electrical current and gas?
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[Mack B]

Dat der pic is just that, a dolphin sender on the stock pick up. It's really not an undertaking, I may have 30 mins in this. I washed n dried the pick up, then stuck a lighter to it before I welded on it tho.
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[hotrodder]

Like he said it is easy to do. I also have dolphin guages in my 63 and neede to do the same fix. I was very thankful for the pics and instructions.

[Hx16457]

I need one for sure! I have dolphin ga. And did not think of what you did and broke the sending unit that came with the gauge set. I might be able to salvage it. Can you give me the "instructions for dummies" version?
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[Mack B]

Originally Posted by Hx16457

I need one for sure! I have dolphin ga. And did not think of what you did and broke the sending unit that came with the gauge set. I might be able to salvage it. Can you give me the "instructions for dummies" version?
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Check your Pm sir!
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[Hx16457]

Thx again for the info!
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[65GMCFirstride]

Mack B, I would appreciate the instructions as well. Thanks!
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[Mack B]

Pm'd it to you, imma go ahead and post it here incase anyone else wants to give it a go

I was nervous about welding on something that has been soaking in gas for 50 years, first thing I would do is wash it thoroughly then do "the lighter test" lol.
Here is the stock unit, I just kinda twisted on the mount till the spot welds broke

Then I took the new sender off the mount, and shaped the float rod (I believe I had to cut some off) to closely match the stock shape.

Then clamped the new sender to the old pickup tube so the arm was close to the stock position, and tac welded it in a few places along the tube (jb weld would probably work)


Then trimmed the wire from the sender down and sandwiched it usining the plastic bushings and used the hole in the top plate where the stock wire fed through (I believe I had to trim the bushing to fit)

Hope that helps some!
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