Sundance Temperature Gauge.

I have a 1994 Sundance, 2.2 liter engine that the temperature gauge stopped working after I timed the engine. The book says to disconnect the sending unit to time the engine. When I reconnected the sending unit the gauge no longer worked. I replaced the engine sending unit but no change. I also checked all the fuses in the fuse box. There doesn't appear to be any broken wires at the sending unit connection. I recently had Dodge put in a new timing belt but now the car vibrates like all heck. That's why I was checking the timing. Until the dealer did this repair the car was running like a top. Any ideas where to check for this gauge problem? Thanks.

Problem fixed. I found a second smaller sending unit between the distributor and the alternator bracket that the wire had fallen off.