Oh my, yes I meant "cooking him" literally, and you are...that's exactly your problem, poor guy...
Those damn ZooMed stick-on thermometers are usually off by up to 20 degrees anyway, so if you're seeing 120 degrees on one of them, which is lethal range, it could be upwards of 140 in reality!!!! I would shut off the lights immediately and go buy a digital probe thermometer right now, they only cost $10 at Petco...adjust the MVB to the correct distance from his basking spot as Tracie mentioned above, and allow the probe on the thermometer to sit on the basking spot for at least 20-30 minutes before reading the temperature (you'll need to leave the light on for about an hour after adjusting it's distance from his basking spot so it can heat up to the temp it will normally be before you place the probe on the basking spot and letting it sit for 20 minutes and reading it). Then move the probe to the floor of the Hot Side, let it sit for 20 minutes again, then read it, then move it to the floor of the opposite cool side, let it sit for 20 minutes, and read it again...
I don't know what size enclosure you have, but I'm going to guess that even if that 160 watt MVB is at the correct distance from his basking spot, it's too much wattage for your enclosure. He's been living in lethal range temps since you got that bulb, I'm very glad he didn't develop heat stroke, though I'd watch him carefully for a while and offer extra
hydration by dripping water or unflavored Pedialyte on his snout several times a day, he's gotta be dehydrated...
Basking Spot- between 105-110 degrees (110 degrees is the absolute max for the enclosure)
Hot Side Ambient- between 88-93 degrees max
Cool Side Ambient-between 75-80 degrees max
Nighttime needs no heat source at all, it should drop considerably lower than his daytime temps, down to 65 degrees is fine, and needs to be pitch black...
Please turn the 160 watt off right now if you haven't already, you got very lucky. My guess is you'll either need to buy a much larger enclosure to use that MVB, or drop down to the 100 watt version.