There are simple answers to at least some of your questions. They're here. Either look for and read a whole bunch, or don't bother.
I read the FAQs and a couple threads already, but again I have no idea about my Matsushita and most of the technical stuff. There isn't really any kind of "noob" tutorial about this kind of stuff, so I have to learn somehow. I thought maybe it was something like the VGA PCB converter boards http://ultimarc.com/jpac.html
but I don't want to buy one if it doesn't work with Matsushitas for whatever reason (too old?) or somethingelse I need.
Thanks for the help though, I guess?
Don't mind gray, he doesn't speak for the collective. As far as your issue goes, cabs failing to power on is not a very good indication of a cab that can't be repaired. Lots of cabs suffer from blown fuses, unplugged or miswired power supplies, back door switches that are not positioned correctly, and any number of issues that are simple to fix. There are tons of stories on these boards about guys getting cabs on the cheap, doing a simple repair, and presto - working cab.
If you're set on Mame'ing tho the best thing you can do is look up the specs on that monitor then post them here that way folks can help you interpret your data and walk you towards a viable solution.
I did manage to fix the power issue just now. The connection to the powersupply from the cord was frayed and the molex was cracked. I fixed it and the machine powers up now.
However, no sound or any kind of visuals come up. The CRT is just blue with some scrolling horizontal lines across it.
I played with some of the connectors too but to no avail. I noticed that a previous owned had done a voltage mod on the board, apparently Pole Positions had a power issue that would fry some of the contacts with the game board.
I tried looking for some information about the CRT itself.
I found the manual for the CRT.
Specs are:
Convergence Tolerance— max. 0.3 mm, center of screenmax. 0.8 mm,
corners of screen Purity—Color impurity should not be found on screen after being degaussed with hand-held degaussing coil
15.734 KHz : 250 Hz Over 50-60 Hz
Pull-ln Range, Horizontal Pull-ln Range, Vertical
Type of CRT #370GHB22, 14-Inch,
90° Tilt of Deflection Yoke F.
Connectors
3-Pin Connector for R.G.B.
Input Signal:Pin 1 =Red Pin2:Green
2-Pin Connector for Sync
Signal: Pin 1 = Blue (sync) Pin 2 = White (ground)
and I could only pull up the schematics PDF and some online posts regarding the different Pole Position configurations. Apparently, Pole Position would be shipped with one of 2 different monitors that were wired differently. The Matsushita's main video connector is documented here:

http://arcarc.xmission.com/PDF_Arcade_Atari_Kee/Pole_Position/Pole_Position_CO-218-09_1st_Printing.pdf - Page 9