Heating up the gauge goes all the way up and comes down then goes up again

My flexplate/flywheel is bad in my 2000 mitsubishi montero sport. I replaced the starter and shortly afterward it began grinding again, now it is failing to engage sporadically. I did this repair on a 72 ford F-100 years ago and am curious what I need to know that may be different when changing it in this newer model

It smokes when idling. I get no smoke at all while driving. The smoke is black and not heavy. I just wanted to know if this is something I can fix myself or do I need to take it to a mechanic? If I am able to do it, How do I go about doing that?

To chang spark plugs

The leak is coming from the side, it was driving fine before it started leaking.

Ice tried jumping someone told me it could security system

The mechanic said my 4x4 box is torn up and I need a transfer box. He's charging about $1140 to installed. Is that about the right price or is that too much?

Replaced a faulty fuel pump, and I have no power to the pump.

It's not the battery or fuses

I was out on a hunting trip.... when I returned to the boat launch, my rear passenger door window was busted out and all my belongings were stolen. I bought a replacement window and have my door panel off.... Just need know how to get it installed.

the bolt came off

I installed deck yesterday and tonight battery and brake light on very dim though. I unpluged negative cable from battery didnt turn off So it s not alternator.need help ASAP GOT TO GO WORK IN THE MORNING

brought vehichle in to have oil changed was told head gasket was leaking also service engine light came on