Installing a oil pressure gauge in a Kawasaki KRX 1000 - it just has an idiot light now. I was planning on putting a T in the port, with both sending units attached.
I thought OP sending units were 1/8 pipe thread ? They are  - kinda

Problem is both sending units have a tapered male thread - it threads in and tightens up in the 1/8 T, But the close nipple will not thread into the Block , it seems a fraction too big.

I assume I could order a tapered thread close nipple? Haven't looked yet. 
I've done similar "conversions" in the past and 1/8 pipe worked fine. 
Any insight?