318 Aftermarket Temp Sender

Yeah, I would have liked to get all electric gauges, but I can't really find anything in a little triple pack. I was lucky to finally find one with a voltmeter. I went to a local swap meet the other day and everything seems to have ammeters in them for some reason. There is already a mechanical oil pressure gauge in the engine bay thats just sitting on an inner fender, so I can just use the line already there instead of going electronic. The temp gauge in the car sort of works, but I'm fairly certain it's not paired to the sender since someone did an engine swap. It reads at the first tick mark of the "normal" range when my laser thermometer says about 180 on the hoses. I figured it should run near the middle at that temp, but I could be wrong.