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What do u mean by spark knock? Missfire? Temp gauge not working could be a few things, sender fault, no water, gauge fault or wiring. Check u have water in it. Then find the sender and earth it out, gauge should go all the way up, if it does replace the temp sender, if not it's gauge or wiring.
Let me know about the spark knock.. Not sure what u mean
If your sending unit is one wire, unhook it from the sender and place a jumper wire from wire to ground. Turn ign on, gauge should pep high PSI. Two wire plug, place jumper between contacts of wires (unplugged). Same thing. What this does is isolate the gauge. If gauge pegs on test, replace sender. If it does it again with new sender, it's the pump. But it's probably the sender.
I would stop driving it right away and test the oil pressure with a gauge. If at an idle when its cool you don't hit 30-40 psi....change the oil pump. The knocking is probably your main bearings. While your installing a new oil pump, put new mains in.
Yes the wire must have been knocked off when the mechanic fixed the belt. Look under the hood for temperature sensor. Its on the motor near the front around the area where the thermostat goes. You may find the wire close by and a "bare" terminal to put it on. Otherwise go back to the mechanic and have him put it back on since he knocked it off in the first place!
Sounds like when you last had someone work on your car, they knocked the wire going to the sending unit off. Look around the thermosat housing, normally located were the upper radiator hose goes to the engine. Most cars have the temp sensor on or around this area of the engine. Most gauges show hot if this wire touches ground(any metal part of car) but some work in reverse.