Ls swap oil pressure gauge

[Thenameless]

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here is the beginnings to trying to get some of the factory gauges back operational. The oil pressure sensor in the pic is what I removed from the gen 3 ls, it has only 1 pin. It looks identical to the parts store stock replacement for my 97. I bought the adapter to ⅛npt but neither of those use that. Can I not just run the LS Oil pressure sensor wired directly to the gauge? The threads on the oem don't need an adapter, I'm a little confused. any help is much appreciated... AGAIN

 

[KansasOBS]

I would have thought your 97 would have the smaller threads, and the stock replacement should have had three wires for the fuel pump cutoff. Guessing thats been bypassed. It would probably be fine to give it a try, don't imagine anything is going to catch fire. If youre that worried about it, put in a new for 97, and just run the sensor wire. The other two are for fuel pump.

 

[L31MaxExpress]

I would have thought your 97 would have the smaller threads, and the stock replacement should have had three wires for the fuel pump cutoff. Guessing thats been bypassed. It would probably be fine to give it a try, don't imagine anything is going to catch fire. If youre that worried about it, put in a new for 97, and just run the sensor wire. The other two are for fuel pump.

Some were wired for the 3 pin sensor and others the 1 pin. My 97 van has the 3 wire, my 99 Tahoe had the single wire. I had a 94 TBI 305 van that also only had the single wire. Never understood why GM bounced around so much on some of the wiring. Kind of like the Isolated vs Case grounded 02 sensors in the newer trucks and the 02 heater circuits. Some used 02 heaters that are wired directly and others run the 02 heater control wiring through the PCM.

 

[KansasOBS]

Good to know. Had a feeling I was going to be told that GM did something weird with whatever things. Ive probably even been under the hood at one point working on a 97 with a single wire, but didn't notice, or long forgot.

 

[0xDEADBEEF]

Just eyeballing it, I would say you need to the 1/4 NPT adapter.

LS Engine Swap M16-1.5 Adapter 1/4 NPT Oil Pressure Sensor Gauge LS1

LS Engine Swap Male M16-1.5 Adapter Female 1/4 NPT Oil Pressure Sensor LS1 LSX LS3 LQ4 LQ9

www.ictbillet.com

 

[Thenameless]

I would have thought your 97 would have the smaller threads, and the stock replacement should have had three wires for the fuel pump cutoff. Guessing thats been bypassed. It would probably be fine to give it a try, don't imagine anything is going to catch fire. If youre that worried about it, put in a new for 97, and just run the sensor wire. The other two are for fuel pump.

You are correct on this. My factory pressure sender on the 4.3 that came out of tye truck had 3 wires. I just didn't understand why people were saying I needed the adapter as this one looks like it threads right in. If I don't need the 2 wires for tye fuel pump I will try to use the LS one wire sender and hope for the best.

 

[0xDEADBEEF]

I needed the adapter to use the 96 sender.

 

[Thenameless]

Started the truck tonight, the 03 5.3 oil pressure sender hooked to the gauge works fine as is. No need for any modification. Now... to get the tach working.

 

[L31MaxExpress]

Started the truck tonight, the 03 5.3 oil pressure sender hooked to the gauge works fine as is. No need for any modification. Now... to get the tach working.

White wire connects to the PCMs tach output. Then adjust the Tach setting in the tune.

 

[0xDEADBEEF]

On mine, going to the 5.3 from the 4.3 the tach was reading low and I had to set something in the tune to output the correct pulses. I can't remember what it is called now.

Found it

https://forum.hptuners.com/showthread.php?15112-V8-tach-output-for-6-cylinder-tachometer