There are a lot of threads with low pressure but not high. Anyways.

Its a 87 TII. BRAND NEW pressure sender. With the car still off and the key turned the on, the gauge automatically shoots passed 110psi. Could I be missing a ground? A black wire that bolts under the trailing coil and plugs into the harness near the pressure sender snapped, and I just replaced it with crimped grounds, but it doesn't have the same black cube for the ground. Does this make a difference?

 

There are two wires that are part of the sender wiring. The wire connected to the sending unit is Yellow/Red and this wire connects to the gauge and the second wire is also Y/R and it taps into the wire that goes from the sending unit to the gauge. The Y/R wire that taps into this wire runs to a condenser (black thingy) that is found bolted to the engine bay and comes from the factory connected to the slave cylinder but could be mounted elsewhere. If one of the Y/R wires is just grounded it will cause the gauge to go to the top reading but more importantly if the wire is grounded too long it will damage the gauge!

 

I gotcha. Will one from a NA fit? Doesn't seem too special?

 

have you checked the capacitor thats bolted to the inspection plate cover to ensure the wire is plugged in and that its not broken or corroded?

 

If you're talking about the sending unit, the answer is yes.

The condenser is a nicety, not required for operation of the gauge.
Many RXs are running perfectly fine with the condenser dangling free or missing altogether.
Few- if any- aftermarket pressure gauges include a condenser in their circuits.

 

Well when the problem came up, I automatically assumed the sender unit as the problem for some reason, so I purchased a new one. So I know that it is not the culprit. Should I try disconnecting the condensor?

 

Your symptoms indicate a dead short between the gauge and the sending unit, the condenser shouldn't affect that at all.
Start looking at wiring.

 

From your original post it seemed you didn't have the condenser aspect at the end of the wire as in the "black cube" and that you grounded that wire. Did you or didn't you do this?

 

Yes. I grounded that wire. I accidently ripped the condensor wire so I just grounded it.

 

It is the Condenser (capacitor) for the Oil Pressure Sender. It is needed to protect the oil pressure gauge from burning out in the event of sender failure, and for smoothing any erratic pluses from the sender. i'd recommend replacing that first

 

The bare wire is not to be grounded! This is your problem.

 

ok. so I just replace the condensor and good deal yeah?

 

what you have is a live wire from the condenser that is grounded or touching the block it then raised the gauge to the top and melts the plastic arm inside the gauge, remove the condenser,and either replace it or eliminate it and tape up the wire ,so it will not happen again,it usually gets pinched between the Bell housing and Block during an engine install,any way, then, remove your gauge cluster and replace the oil pressure gauge ,it has been Damaged the white plastic arm in the gauge is melted through........................................... ........FP

 

Anyone verify?

 

I've the same issue.

Has this been solved?

 

Once you disconnect the wire that shouldn't have been grounded you will find out pretty quickly whether or not your gauge is damaged goods or not.

 

Time to go aftermarket I guess

 

They read but they don't listen to what everyone says?

If you guys are going to post up a issue then "Listen" to all those that take the time to post responses! :-)