Smith's Dual gauge

[MKCASPIAN1@aol.com]

Hello Spitfire owners,
Two issues - I currently have an oil light which always stays on. Turns off 
when ignition is off.  No flickering, just aways on.  Engine is running great.  
No oil pressure issues. Loose wire?  Bad sending unit? 

Does anyone have any experience with the Smith dual temperature/oil pressure 
guage.  My Temp gauge always shows very low, even when engine is completely 
warm and coolent measure 180.  Maybe I could fix two things with one gauge??
John
78 Spitfire