Reddit mentions of [Gulfcoast Robotics] Thermistor Upgrade for Maker Select Plus and Wanhao Duplicator i3 Plus 3D Printers.

One of the biggest upgrades I have to recommend is flashing new firmware. The default firmware doesn't support thermal runaway protection and it's fairly straightforward to upgrade. Here's a video guide for the process.

Second is to upgrade the thermistor. It's not necessary, but the one I have can survive up to temperatures as high as 600C and is easy to remove during cleaning.

The third upgrade is the most tedious and not necessary, but it's what I did after my first heated bed connectors melted to the Melzi board. I upgraded all of the wiring with 12+14 gauge copper wire. It might be an over kill, but it keeps me sane.

I've done that and it's seated. This is the replacement I put in. [Gulfcoast Robotics] Thermistor Upgrade for Maker Select Plus and Wanhao Duplicator i3 Plus 3D Printers. https://www.amazon.com/dp/B07B3ZYBTM/ref=cm_sw_r_cp_apa_fTvLBb3Z93P59

Hello there. This is a rebrand of the Wanhao i3 Plus, so if you need some help, googling information about that printer, or its popular rebrand, the Monoprice Maker Select Plus, may give some answers. I have the MPMS+, so I may be able to help you out. Your old heater block had two holes because it is able to take two different sized thermistor screws. Your new heater block can only take one. It looks like an M3 screw hole maybe? It is hard to tell. But yes, you should be able to put your thermistor cable into the hole with the right screw just fine. As for where to put the heater cartridge plugs in, your daughter board should look like this, right? You would plug it into the one labeled heater. Also, I upgraded my thermistor to a screw based thermistor, which I would recommend. I think it would be compatible with the block you have there if you're interested.

I overpaid and got this , but temperature regulation is a big deal, you don’t want melted Teflon or a fire.

https://www.amazon.com/gp/product/B01E1HANLS/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1

Had almost the same problem on my Monoprice clone - would stop feeding, changed brands, etc. until finally the filament had fused to the PTFE tube in the hot end. Required a complete tear down to find it. I figured as long as I'm in there, upgrade the extruder plate

https://www.amazon.com/gp/product/B06WVB6CYD/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1

and the thermistor

https://www.amazon.com/gp/product/B07B3ZYBTM/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1

Follow the instructions - do not skip the "tight, then back off 1/4 turn. Heat up to 250 and then tighten the nozzle" steps.

Strip off the Kapton tape (if it hasn't already torn off) and use these instead

https://www.amazon.com/gp/product/B07B9KW1L1/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1

Got mine coming from Amazon [Gulfcoast Robotics] Thermistor Upgrade for Maker Select Plus and Wanhao Duplicator i3 Plus 3D Printers. https://www.amazon.com/dp/B07B3ZYBTM/ref=cm_sw_r_cp_apa_i_UEj-AbEW6YMN5

Man, thank you for helping me so so very much. I will begin by trying to help you answer anything you ask as best I can. From what I recall considering this thing is now over two weeks old and I've done like of stuff to it yet still having no luck (yet moving forward) I can say that the person I bought it from had apparently thought it was a thermistor issue as the old one was still on but in bad shape. So I tested it with the wires still attached and I thought it read pretty good like close to the 100k ohms I'm looking for on my other printers thermistor.

The one I put in it is one of the 100k ohm-er's I was speaking of and as far as I can tell it very likely is the cause of this 700° BS that is going on now...

Everything should be hooked up right as I went and double checked that as soon as I encountered.this issue after replacing the thermistor.
Here is the screw in thermistor I haven't tried yet:

[Gulfcoast Robotics] Thermistor Upgrade for Maker Select Plus and Wanhao Duplicator i3 Plus 3D Printers. https://www.amazon.com/dp/B07B3ZYBTM/ref=cm_sw_r_cp_apa_i_SHqyCbFDJB3A5

This is an Amazon link to the thermistors and heaters for the hotend that I've put into it since getting it:

Sunhokey 12V 40W Cartridge Heater and NTC Thermistor 100K 3950 for 3D Printer(Pack of 12pcs) https://www.amazon.com/dp/B07KXSFSKP/ref=cm_sw_r_cp_apap_kiwvfNkNbZTWP

And it looks like the E3D V6 hotend that I think comes stock on the makerfarm Pegasus 10 models.

And this all being said and what you have already mentioned it is highly likely that I need new thermistors? I did go to the site that sells these and the heater I put on it at least claims all the same specs. 12v 40 watt heater... So I felt better after reading that considering I had already put it on this machine...

You are a terrific person for reaching out to me about this I've had a few folks reach out and I'm still dealing with these issues some of them the same ones. I don't expect there to be a ton of folks out there that are expert enough to just take on this sort of thing site unseen so I will do my best to accommodate you in any way that may help me gonna go post links to some pics of I can....

I searched a little bit and someone said that this one worked for them, so I'm going to order it and give it a try. Thanks!

Do you have pictures? I'm interested in what you actually got.

If you're missing the screw hole for the washer to hold it in, you can get https://www.amazon.com/Gulfcoast-Robotics-Thermistor-Duplicator-Printers/dp/B07B3ZYBTM/ or something similar, which is the same type thermistor, just in a screw mount instead.