[Vwdiesel] Oil cooler on N/A diesel

[Libbybapa at wmconnect.com]

I have an '86 jetta na diesel.  It does not have the oil cooler mounted above 
filter.  Is there any issue with adding one on?  Also, on the same car I have 
noticed that the water temp gauge reads significantly higher (sometimes 
almost redline- light never goes on)  with running lights or headlights are on.  It 
seems unaffected when any other accessories are on.  I attribute that to an 
electrical problem, but it seems that the heater blows hotter air also (I might 
be imagining it).  Any recommends?  Drive without my headlights or running 
lights on?  Thanks, Andrew.