Turbo Gauges in a NA car

[nothingfiction]

Ok, i am not sure if this is the correct place to post this... But here goes...

Ok, I have a 2nd gen eclipse non turbo. i have swapped the oem 420a gauge cluster for the oem 4g63 gauge cluster. Simple enough to follow so far? Good.

Most of the gauges work and run as they are supposed to.

RPM, Kmh/MPH, water/coolant, fuel... they all work.
the Boost gauge does not work but thats obviously because i have no boost (yet).
Now onto the real question...
the Oem oil pressure gauge (main reason i picked the cluster up)...
i already have an aftermarket oil pressure gauge that works and is installed.
but i can't figure out how to get the oem op gauge to work.

i already have a aftermarket oil pressure sending unit. i have wired the oem gauge to the aftermarket sending unit, but now the aftermarket oil pressure sender reads way high and the oem gauge does nothing. i know the gauge itself works because when touched to a ground it goes way high.

could there be a ground connection that's not right?
i am thinking it is a ground because since both wires for the gauges are connected to the same sending unit wouldn't that mean they are bridged? That could explain why the aftermarket gauge reads high and the oem gauge reads nothing (i think. ...it makes enough sense to me at least) so in that theory i should just check the oem ground and maybe double ground it and like relieve strain on the aftermarket gauge. of course this is all just theory and i really don't know. Maybe i should just run two sending units? could that help? or would it still do the same?

i need a wiring genius .

thoughts? suggestions?
i would love to have both gauges functional if at all possible.

 

[nuclearr]

You probably need a 4g63 sender. My guess is they are different voltage or amperage.

 

[knochgoon24]

2 things.

Most oil pressure gauges work by measuring a change in resistance as oil pressure changes. The range of the change can vary between manufacturers. You'll probably need to use a separate OEM sender from a 4g63. And running 2 gauges off one senders is a no-no.

#2, How are you planning to wire up the factory boost gauge so it works when you turbo your car? That gauge is controlled by the ECU. There isn't a sender like there is for the oil pressure. This is why it is so inaccurate.

 

[nothingfiction]

for the boost gauge, it is and will remain a dead gauge. i don't think there is a way to fix that and i don't care. you 4g63 guys are always getting aftermarket boost gauges anyway so why care if 1 gauge is dead.

my main concern is the oil pressure gauge. having 1 dead gauge is fine. but i don't want 1 whole slot dead (boost and op are in the same slot)

and as 1 of my theories i was thinking i would have to run two separate sending units and using an oem 4g63 sending unit makes sense. my thought would be, where exactly would i mount that? would i mount it on the other side of the T fittings i have for the aftermarket sending unit?

 

[#40Fan]

If all you wanted was the oil gauge, why didn't you just find a cluster with it already that cam in N/A's?

 

[nothingfiction]

the 420a never had a stock OP gauge unless you count the v6 avenger (which has no boost gauge but does have OP) ... which is obviously not a 420a so more modification would be needed to get it to work.

 

[turbolarry]

Just throwing out ideas but I don't know exactly how to do it; there is a way to have the 2g boost gauge indicate knock.

 

[ramsack]

Is the oil pressure and boost gauge not the size of a normal 2-1/16" gauge? If so why not just put an aftermarket oil pressure gauge in there?

 

[cookmeup272]

Yea with dsmlink

 

[#40Fan]

1995 Avenger 420a with a oil pressure gauge in the instrument cluster. I have seen this personally.

And the V6 and 420a both had the same sending units when they have a gauge.

 

[dalesmitsu]

Question, what was wrong with your oem cluster.