7mgte gauge problems

IndigoMKII

New Member
May 9, 2011
2,181
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0
Madison, Virginia
Okay well here's my problem. I've been scratching my head at it for awhile now and even looked at the TEWD but can't quite figure this out. I'm not sure if all these problems are tied together or not either. So here it is, I finally dropped my engine and got everything hooked up, I primed the engine by turning the starter over for around 15 seconds 3-4 times as to not overheat the starter motor. After I felt it was primed I turned the key over with the EFI fuse in and she came to life but quickly after it started running I was checking my gauges only to quickly turn the engine off after NO oil pressure. In seeing this I started to double check everything, made sure the oil pressure sending unit was plugged in. I pulled the dash down and made sure that everything was plugged in along with no toasted wires or anything. The gauges on my car work minus the oil pressure and fuel gauge along with the radiator light stays on, even though I know it's full of fluid, the gauge cluster lights don't come on or my interior lights. I have checked every fuse possible all over the car so I decided to check some things by adding power to the dimmer switch, with power to the dimmer switch the gauge cluster lights DO come on. The interior lights go on and off when the car is running. I've checked the wire running from the oil pressure sending unit to the ecu and the wire is intact. I've looked further into the TSRM after this as to how to check the gauges themselves and with the key on the fuel gauge nor oil pressure gauge return to 0 or E. I'm not sure if this is everything I wanted to type out but I'm sure if I missed anything I'll edit this post.
 

hvyman

Dang Dude! No Way Man.
Staff member
Apr 17, 2007
12,568
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Fullerton,CA
Is it a usdm oil pressure sender?

Everything else plugged in under the dash. What else have you done besides the engine.
 

IndigoMKII

New Member
May 9, 2011
2,181
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0
Madison, Virginia
Everything is stock. Just installed the 7mgte I rebuilt along with the transmission and got it running. Just trying to get everything working to get it drivable and inspected. The previous owner has messed around with the head-unit wiring so I think that has something to do with the no gauge lights and interior lights. I need to check the light control rheostat to make sure it's in working order. I've taken the gauge cluster completely down and inspected everything. Electrically the gauges work but I can't get the gauges to work with the harness plugged in. I can force the gauge lights to come on by hooking up a fused wire to the plug but still no interior lights.
 

IndigoMKII

New Member
May 9, 2011
2,181
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0
Madison, Virginia
Okay well I double checked all of my connections several several times and finally got some contact cleaner. So I sprayed all the contacts and cleaned them, buttoned everything back up and I've got oil pressure.