I have been trying for the life of me find a tacho sending unit and how to wire it up. The reason i want to add an additional analog gauge inside the cabin is because very now and then i dont trust me digital computer unit that gives me the RPM reading. I want to install a 2.5 inch diameter gauge to see if there is any difference from digital to analog read-outs.
does anyone who where i can purchase the tacho sender unit; make and model and size/length of thread and diameter of sender unit?
I am assuming the additional sending unit I am looking for has 2 wires coming from it - one wire that will connect to any positive 12v wire, while the other wire gets fixed/grounded to a negative terminal or ground? or does the other wire get attached to some other part of a circuit?
I tried to look on Amazon but i can only find big tacho sending units; for example, they are 1/2 inch diameter and 3 inches long - way too big.
My ground adjustable Sensenich propeller is super sensitive anytime I try and adjust the pitch of the blades, the RPM's (during a static run-up test thereafter) seems to move +/- 200-300 RPM difference - then on top of all that, my static test run-up will (for example) indicate a max RPM reading of 3200RPMs, but then when/once I apply full power during real-time takeoff, the RPMs give me a different reading (usually another 100-300RPM) higher than my static ground test. Lastly, the RPM readings seems to change while I am either flying by myself or when a 210lb passenger is flying with me.
My goal is to have max 3300RPM, for finer pitch setting; ultimately yiedling faster climb-out. I am not looking for faster top speed but rather STOL capabilities on grass airstrip my X Air is based out of.
Any guidance regarding the above make/model and installation is greatly appreciated.
Thank you kindly,
Justin?
