Oil pressure sender thread size F.Y.I.
For members info to save the headache I've been through the thread size of the Boss oil pressure sender unit is 1/4" 18NPTF Tapered.
Redline make the perfect adaptor to keep the stock unit plugged in and add an aftermarket remote mounted sender like the Autometer unit, the Redline part # is RGA-32.
Hope this is helpful to some.
I said to the ICWS ( In Car Whingeing System )
"What's the problem, it's a victimless crime...except for him, he lost!"