New wiring, new temp switch, new gauge, still not working

[alden]

Hey folks, the stock thermostat has never worked on my truck (1959 Fleetside, 235 inline 6, manual 3 speed with granny gear if that makes a difference) since I bought it but I figured after replacing the wiring and the switch that would do it, but no luck. I just replaced the gauge today and am still getting nothing. My multimeter (just like this):



just blew a fuse so I can't use it at present, but once I get it working again what should I be testing (and for that matter, what setting should I have it on)?

Thanks!
Alden