schematic,been reading your replys for some time now.you always come up with the anwser.anyway, looking to rewire entire boat.after years of different people splicing this and that together,decided to do it right.cut all old wires[mostly red/black]to old gauges. i only have engine harnesses hooked up to console back to engines now.boat is a 1979 robalo center console with twin 1985 merc 175s o/bs with twin throttle control with t/t switch in handles .it had original old quicksilver gauges on boat.decided to buy all new teleflex gauges/flo scan meter /flo scan tach/water temp/water presser/tilt/trim in dicaters/volt meter and a garmin fish sounder. at west marine.over 3.000.00.wife almost had heart attack. .i have all the tools,but not the know how to hook up properly.also cannot figure out t/t.new engines have solenoids on carbs.eninges i had before did not.they were in battery box along with solenoids + trim motors that did work off throttles .can you walk me thru this step by. step?