tempurature and malfunctioning tach

["Cameron Putsch" <putsch.1@xxxx>]

I am going to look at an 82 dmc with 27k on it which is a strait, clean, turnkey car, however the tach is said to work half the time and the water temp stays at 200 degrees. What do you all think it would take to fix the tach(money and time wise too) and what do you think about the temp, is this a scary thing on a stock D or is this not that bad and would be fine with a lower temp fan switch and thermostat(perhaps the thermostat is stuck half open? Other than that I have to beleive the car is exactly as it should be. 
Thanks, Casey at putsch.1@xxxx


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