Oil pressure (now with write-up)

[Crazy K]

Ack!! You got me!!! You got me.... I actually read all the way through what you said, but I actually was refering to the conversion of 93-94 CS dummy guages! Sorry

The guy who did a guage conversion on a 95-96 impala (converted from a cop car) said he added a resistor somewhere, and the sender. I'm going to try to relocate that page, but if anyone else knows how to do that, let us know! (I also want to add a factory style guage to my 95 CS, and if you could run an external guage salvaged from some other cluster linked with the idiot light still serving as the fail warning....)

[Supreme Cutlass]

Ack!! You got me!!! You got me.... I actually read all the way through what you said, but I actually was refering to the conversion of 93-94 CS dummy guages! Sorry

The guy who did a guage conversion on a 95-96 impala (converted from a cop car) said he added a resistor somewhere, and the sender. I'm going to try to relocate that page, but if anyone else knows how to do that, let us know! (I also want to add a factory style guage to my 95 CS, and if you could run an external guage salvaged from some other cluster linked with the idiot light still serving as the fail warning....)

 

Did 94's have the UB3?

[Crazy K]

The 94 cluster is a UB3(and the only one put into the car that year), but it is not the digital UB3 everyone drools over(stopped in 92. It displays the exact same info however, except for the fault that I just found out about, which is that the oil guage is a dummy guage.

Also 93 and 94 guages are identical, EXCEPT 94 has the airbag light added, but I don't know how much it affects the wiring.

BTW the temp guage does works(but looks stupid with a oddly spaced range).

[Supreme Cutlass]

Then a 92 sender should work right? I don't have a 94 manual so I don't know the specs on resistance, etc. I could've sworn someone used a 92 sender and it worked.

[Supreme Cutlass]

put that into the FAQ

 

 

is sealant required on the threads?

 

also, what store did you get the sender, the socket, and how much did it cost?

 

also, is just sender replacement needed? or are other mods required

 

there's already coating on the threads

 

an actual sender costs about $21-25, the socket is only about 3-4 bucks at autozone

[Crazy K]

someone needs to try it. I have a 94 factory manual, it shows a switch, which breaks the curcuit above 4psi. Below that and the light will be on. I would imagine that the sender would make the guage vary, but on a 92 with a non-guage switch the guage would be pegged, but on the 93/94 it stays midrange. so the range of possiblity would be the mid low range.... unless the needle can be adjusted???

OK, places where the resistor may go... between the oil sender line and the solid state control for the Check guages light, OR on the guage's hot feed line (electric problems have spiked guages, so this is my guess) OR the guage's ground...

or a combination!

[93CutlassSupreme]

put that into the FAQ

 

 

is sealant required on the threads?

 

also, what store did you get the sender, the socket, and how much did it cost?

 

also, is just sender replacement needed? or are other mods required

 

there's already coating on the threads

 

an actual sender costs about $21-25, the socket is only about 3-4 bucks at autozone

 

 

was sender replacement the only mod required to change the pressure gauge to full function, or were resistors needed?

[Supreme Cutlass]

I don't think you need a resistor, just a 92 sender. I'm kinda unsure though :oops: as I changed my entire cluster, so I'd wait until someone who's knows for sure posts.

[Crazy K]

found what i read:

the excerpt from

http://captainpackrat.com/Misc/ratmobile2.htm

 

"I've modified the oil pressure gauge so it displays accurately. (The stock Caprice/Impala oil gauge doesn't actually display oil pressure; if the oil pressure is above 4 PSI, the needle will always point to 75%, regardless of the actual pressure. By replacing the oil pressure sensor with the police version and removing a resistor from an electrical harness, the gauge will read the correct oil pressure) Unfortunately, the calibration markings on the non-police Caprice and Impala are designed for the fake sensor, so the oil pressure frequently reads into the "low" range, even though the oil pressure is just fine. (The instrument panel on the police version has the correct markings) "

 

add the oil presure sensor and it looks like you have to remove a resistor! I have a spare guage set, but have to wait until february to test as it is stored. sorry... can anyone find out more about this?

 

p.s. my bros oil guage does move some, enough that it fooled me... I have determined that thats due to some weak electrical condition that I'm still trying to firgure out how to solve.

[Crazy K]

HEY! found this in the manual

"[fuel pump/oil pressure switch] opens above 4psi, sending curent through the In-Line Resistor to ground. This moves the pointer to the middle of the range, indiacating normal oil pressure. A 68 ohm In-Line resistor keeps the indicator from going full scale with normal oil pressure."

 

The resistor must be on the ground line for the sensor. If you remove it and put in a gauge sender, it should work fine, the only question to remain would be if it screws with the check oil/gauges light. (probably not!)

[Crazy K]

UPDATE!!!

 

I have not got anything to work, just yet, but I have determined how the guage gives a maximum reading of 5/8. The guage max is regulated by resistor on the rear of the guage inself. These are attached to the coils or the guage. There are two resistors, they measures 75.2 and 47.2ohm. I've experimented with bypassing them, but no solid result yet. It remains to be seen if an oil sender will foul up the low oil presure CHECK GAYNESS light

 

has anyone tried the sender swap to see what happens?