Rally dash redo

I would get the gray wire off that sender now. Could be overheating that gauge.
edit; Curiosity got me so went to look... 23 ohms on this gauge is 40 psi +/- 5. and you gauge is now showing well over 80 psi which is as far as the scale/chart goes.
After warming the oil up to 170ish F, oil pressure dropped to just above 6th mark.
upload_2020-8-24_17-59-8.png

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If that's around 60 psi, its still pretty high for 8 - 900 rpm.

I'll keep an eye on it.

The sender I bought from BRE is supposed to be for 0 - 80 psi, replacing p/n 2495222
http://www.billrolikenterprises.com/proddetail.php?prod=2495222

Rolick has a different one that is stamped 100 psi that he says was used from march 71 to 74. p/n 3488609

The one on the engine now is NAPA Echlin OP6603, installed in 2000.
Online catalog says it rated for 90 psi.
https://www.napaonline.com/en/p/ECHOP6603

Need to think about how that might effect the gage reading.