Rb20det wont start anymore

[assbitbo]

Ok i just recently rebuilt my rb20det. first day i attempted a start it worked but the rev was really high. found out we had adjusted the throttle cable to tight so we backed it off and started it again. now i had installled an aftermarket water temp gauge and it was reading 250 degrees. then we found out it was making contact with something and when you tun power on to the car it would start its readings at 210. so we fixed that problem but now the car wont start anymore. we ended up taking out the stock sender and placing mine in that spot. i have read somewhere else that this could cause you to run to rich to where it just floods the engine is this true? its not the one on the block its the one right next to the upper radiator hose. im going to try a small list of things i have found researching different sites for similar problems so maybe one of those will fix it. any input would be great thanks