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Old 02-28-2014, 12:36 PM   #1
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Default Oil Pressure Sender/Gauge not Working w/MSPNP2

So just got the MSPNP2 installed on my 1990 Na, and all is running fairly well on the base maps...AFR, idle speed (need to fiddle with closed loop settings) and few other things still need to get dialed in but pretty close.

One immediate thing I noticed was that my oil pressure gauge was no longer operating, I spoke to the folks at DIYPNP and they said the MSPNP doesn't read the sender thru the stock wiring loom.

Instead I was told that I need to rewire and directly connect to the gauge....i've looked high/low on Miataturbo, google, etc and have not found a clear write up on how to do so....anyone here have link or description of what needs to be done?

thanks!
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Old 02-28-2014, 12:41 PM   #2
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Do you mean your OEM oil pressure gauge is no longer working after the install or that the MS doesn't show a reading for oil pressure?

You need to install a separate pressure sender and wire that input to the MS, then configure that input in the software.
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Old 02-28-2014, 12:47 PM   #3
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Quote:
Originally Posted by Oscar View Post
Do you mean your OEM oil pressure gauge is no longer working after the install or that the MS doesn't show a reading for oil pressure?

You need to install a separate pressure sender and wire that input to the MS, then configure that input in the software.
yes, sorry if it wasn't clear. The OEM oil pressure gauge is no longer working...do you know where I can read up on the install, what the correct sender I need (is that in replace of the OEM sender) and rewiring that's required?

Assuming that means adding an addition pin on the options port (like i did for the GM IAT and Knock sensor)
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Old 02-28-2014, 01:12 PM   #4
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MS has NOTHING to do with this. OEM OPG and sender is an independent system. You've broken a wire/connector or something (ground maybe?) is disconnected.

Look at you OEM wiring diagram to trace.
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Old 02-28-2014, 01:14 PM   #5
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Quote:
Originally Posted by 90eunos View Post
yes, sorry if it wasn't clear. The OEM oil pressure gauge is no longer working...do you know where I can read up on the install, what the correct sender I need (is that in replace of the OEM sender) and rewiring that's required?

Assuming that means adding an addition pin on the options port (like i did for the GM IAT and Knock sensor)
Check if the red/yellow wire on the pressure sender (pax side of motor, below intake manifold) is still connected. Single spade connector.
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Old 02-28-2014, 01:24 PM   #6
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Originally Posted by hornetball View Post
MS has NOTHING to do with this. OEM OPG and sender is an independent system. You've broken a wire/connector or something (ground maybe?) is disconnected.

Look at you OEM wiring diagram to trace.
Are you sure? This is the exact email I got from DIY AutoTune.

"Hello,
The MSPNP2 units do not intercept or take any information from an oil pressure sensor from the factory harness. The sensor should be wired directly to the gauge."

Strange...Im fairly certain that no grounds or wiring were disturbed, just added the GM IAT and plugged in the MSPNP.
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Old 02-28-2014, 01:25 PM   #7
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Originally Posted by 90eunos View Post
Are you sure? This is the exact email I got from DIY AutoTune.

"Hello,
The MSPNP2 units do not intercept or take any information from an oil pressure sensor from the factory harness. The sensor should be wired directly to the gauge."

Strange...Im fairly certain that no grounds or wiring were disturbed, just added the GM IAT and plugged in the MSPNP.
it is and worked fine with the OEM ECU....
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Old 02-28-2014, 01:32 PM   #8
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I'm sure (I gave you exactly the same answer you got from DIY).

Something broke. It's an old car. Basic troubleshooting required here. Drop the connection to the MS because that is just confusing you.
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Old 02-28-2014, 01:40 PM   #9
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Originally Posted by hornetball View Post
I'm sure (I gave you exactly the same answer you got from DIY).

Something broke. It's an old car. Basic troubleshooting required here. Drop the connection to the MS because that is just confusing you.
ok..thanks...ill triple check everything...to my knowledge the wire is connected by a spade and then runs into the wire loom. I'll try the factory ecu/airbox again..and see what happens.
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Old 04-12-2014, 08:06 AM   #10
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OP, finish up the thread and let us know if you figured it out and, if so, what the issue/fix was.
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