Well, if you don't have a capillary tube, or the reminants of one, coming off the block, then I'd guess you have an electric temp gauge. No idea where the sender would be mounted on your engine though.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.