this is kind of a crossover question not sure where to put it

[4x4wheelin]

alright here it is, i have a 67 m715 that i swaped onto a 75 chevvy chassis, i am in the process of building it with my brother and have gotten down to the finishing touches, we installed the chevy wiring, heater boxes, and hvac, we made a custom dash, with autometer gauges, i used a painless wiring harness
for wiring them, and had to lengthen and re route some of the wires for them, i got all the wires lengthened and hooked up and all light and wireing was working correctly, till recently, was working on wiring in the radio and pulled the lights on and found that the left front turn signal is on all the time regardless of switch position, some times it will not shut off with key either,
no turn signals are able to flash, but if i pull the flashers on the lights will only flash with the key on, the right side works perfectly, but will not flash with the turn signals, but does flash with the turn signals, i have no fuses blown, and the left font marker does go out when the cluster fuse is pulled also when the lights flash the gauges flash also, but only the ilumination for the speedo, and it appears the gauges cycle on and off when this happens,
my problem is this just started whel we cut the holes in the dash for the radio and hvac, we had the gauges removed, so i many have one or more wires crossed but havent had time to look yet, so i thought i would throw
out my problem to the collective whole and see what you all suggest,
i think i am going to pull out the dash panel again and reconnect all the guages and indicator lights and if that doesnt work i will pull the connectors on at a time until i either discover the problem or run out of gauges, if
i dont i would appreciate any help that can be given, if anyone has run into
this problen before please please help me from pulling my hair out and help me with insite into what was the cause for you, as an aside i checked out all the wiring prior to installation and it was not nicked cut or falling appart, and
the bulkhead connector it installed correctly and no pins are bent over, also any other withing added for accessories was run through an auxillary fuse panel feed directly off the batteries via solenoid.
anyway there it is i know it is kinda long but wanted to give all the info i could think of so you know as much as i know, thanks in advance