oil temp

[BCAH@aol.com]

does anyone have an oil temp guage on their  A series engine?  In my tool box 
I have an interesting part,----it is a hollow banjo bolt like the one which 
secures the external oil pipe to the engine. That pipe then runs to the oil 
filter.  The way I figure it is that one uses this hollow bolt and then 
screws in a temp sending bulb for the oil temp guage. For that matter , I 
suppose you could screw in any mechanical bulb .  Has anyone seen this?       
         Bob C