Tach stoped working on 84 El camino.. Any ideas?

84Black&Silver

Daily Driver
Dec 14, 2010
30
0
0
Oakland CA.
So now that i got my car all back together and on the road my Tach stopped working. it was working fine before and then one day i guess when i was under the hood working on something (with the car on) the Tach jumped all the way around and now wont move from there. what could this be? Thanks in advance for any help , info , and suggestions.
 

MalibuRacing.com Gear

Stickers & Shirts!!