I just bought a universal oil pressure sender and mounted it via sandwich plate and now my oil pressure reads 60 at idle, 110 under heavy throttle and somewhere inbetween while cruising. a fellow first gen guy on facebook said something about maybe a bad ground so tomorrow im gonna try a different ground location and clean the connector that i plugged into that goes to the gauge. any other possibilities? Btw i searched but didnt find anything similar.

 

That would be realistic if oil modification have been done.

 

if ur using the stock gauge, sounds like u don't have the right sender for the gauge. senders have different ohm values. get the sender for ur specific yr, not universal. i found this out many yrs ago when i put an 83 engine in a 75 808. the 83 sender pegged the stock gauge. swapped in sender from the 4 banger that came out of the 808, gauge worked fine.

 

will the stock 83 sender fit a 1/8 npt thread? know where i can get one cheap?

 

it's not standard NPT thead. there's a thread on this site where someone mentioned with the thread is on the stock sender.

EDIT: found it

https://www.rx7club.com/showthread.p...r+thread+pitch

 

would this work?
http://cgi.ebay.com/ebaymotors/Auto-...ehicleQ5fParts

 

also found this but it says it fits a list of cars.
http://cgi.ebay.com/ebaymotors/E1804...Q5fAccessories